Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0058e8d81efdf83…

MALICIOUS

PDF

67.8 KB Created: 2021-01-21 12:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 87a3b1770e9d87175221b83c5a4001b9 SHA-1: 2660a88771cff21c1ba3e1a477a85c511ed4cf20 SHA-256: e0058e8d81efdf83ae0ae85d5eb1e0960bbf6fd1fc99d125d766e6a9bab845e2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=eye+vac+professional+filter In PDF document text
    • https://cdn.sqhk.co/ruvivifid/bgegjhd/14873736007.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/bjfjaja/22241257396.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/23f4ce12f57f7b.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/witcher_3_gwent_beginner_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/ic8icge/65277361360.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/zawebu.pdfIn PDF document text
    • http://xowozumevabig.66ghz.com/bofuwozerolexukiladuwem.pdfIn PDF document text
    • http://torevifij.iblogger.org/97366237846.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/reformed_baptist_churches_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/gz2khaF/20964836361.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/manual_audi_q7_2017_espaol.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
    • http://famebod.epizy.com/instagram_photo_frame_prop_template.pdfIn PDF document text
    • http://rejefuwozumij.rf.gd/millennial_generation_research.pdfIn PDF document text
    • http://kovusilo.epizy.com/eastlink_tv_guide_listings.pdfIn PDF document text
    • http://pagupim.epizy.com/47341529636.pdfIn PDF document text
    • http://zafovitunopejus.epizy.com/molujisabodoxamakime.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 4916 bytes
SHA-256: c5e0f8c0216d6e3c59c0557d2253b02d9d2baa87ad7690d776941df30a0006e3
font_01_sfnt_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 10088 bytes
SHA-256: 1b71f460659988cab8bb9aa5a2d8ab3f86a13a8cb1023fe8df31fbe1120d44f9
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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