Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab0958ac2f6cbce…

MALICIOUS

PDF

176.2 KB Created: 2021-05-29 20:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c6ebb93cde3929717dc394a5c27d6c5a SHA-1: 55964fe000a445710baae5c5ff07f35220c5786c SHA-256: 1ab0958ac2f6cbce207ca8cdbd18bbe07c53c3dda828f0b23d6c91f326c0d21b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it contains links to known malicious redirector infrastructure. The embedded URL `https://crophysi.ru/123?utm_term=lol+zoe+support+guide` is a primary indicator of this malicious intent. The document's structure and numerous links suggest it functions as a link farm designed to lead users to harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9333

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=lol+zoe+support+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fd1023e0edb1.pdfIn PDF document text
    • https://sufivelogazawe.weebly.com/uploads/1/3/4/6/134600369/2047610.pdfIn PDF document text
    • https://tebisemilemuwi.weebly.com/uploads/1/3/4/8/134864217/pukilodokikagez-sufeligatu-viremasel-kawafa.pdfIn PDF document text
    • https://vowegokemawo.weebly.com/uploads/1/3/4/3/134353822/8974a5d14fa57.pdfIn PDF document text
    • https://putujagojosid.weebly.com/uploads/1/3/0/7/130738675/3d810927.pdfIn PDF document text
    • https://pifelitasa.weebly.com/uploads/1/3/5/3/135350032/tuzajimoj.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/7621569.pdfIn PDF document text
    • https://donaleta.weebly.com/uploads/1/3/4/4/134481941/283f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe121e0ae87f.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/3294f38e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603a11e84bbb1.pdfIn PDF document text
    • https://deronabopopunol.weebly.com/uploads/1/3/4/7/134728657/bakomulip_zarefivum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ffda476b2298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_5fd8897a45f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_604981cf334a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5fdd8de4aed63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_602578f765868.pdfIn PDF document text
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/8457902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/40d6b966-f3f0-4217-8adb-dc1b4b7361d7/seo_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ee581a-d01a-42fb-82bb-c8fc0045161f/what_is_the_purpose_of_an_alligator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2796f5-daa2-403c-b4e3-a4ef4cd47970/jazufudejepanesulelit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db274c1a-a763-4e13-8c5f-1fe6d8542e61/kunuremag.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000226ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226FF 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off00023748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23748 3676 bytes
SHA-256: fd5b84d8f55420be0cd17d1459cc55d3c919d2ad1a9d2afde0711c00182f35a4
font_02_sfnt_off00024460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24460 4684 bytes
SHA-256: 00866989d59e7fbc4eeb1ff909270ef6d1f73a95531a8ff0245a55102b1ba507
font_03_sfnt_off0002546b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2546B 3192 bytes
SHA-256: 6f3f1ba81e8472ba9e4cf58e83f9aa820e59348ec9f9b3d45500de7a9e1d140c
font_04_sfnt_off000261ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261ED 13720 bytes
SHA-256: 5482c951d77afd070b23e6cdd591c85d4fda15b2aaa117d95bb917b052a5e4be
font_05_sfnt_off00028e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E1C 16236 bytes
SHA-256: 2a1ac2916b69e43467ff31a738014e7be3c5ff5c19bc8c23f7883670ecfb0944
font_06_sfnt_off0002a333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A333 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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