Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f64ad47d3da6d7…

MALICIOUS

PDF

115.6 KB Created: 2021-04-04 20:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e0d521d85984e8450c61defec3d8f378 SHA-1: fc4f12fbd488675fd242de5f035ae1a6248792a5 SHA-256: 69f64ad47d3da6d794193264396857d6fbc56cc7ea805c49715ed48f6cbd3a18
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for link aggregation, a common tactic in phishing and malware distribution campaigns. No scripts were extracted, but the presence of numerous external links strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/wix?keyword=hoshi+no+kaabii+theme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fdab000bf9d7.pdfIn PDF document text
    • http://mini-cam1.club/buzukajenovw2rnv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fc847ab1e7c7.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/cibXJif/runufepedakosoxikowifi.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/hifij8P/ruzagutejupes.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/zudata.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/hrcigge/lewedubukutason.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ffae81926df2.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/parrot_bebop_2_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/jdMjioD/worix.pdfIn PDF document text
    • http://poradoit2.site/electronic_devices_and_circuits_boylestady435g.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/cjfYthb/rawigujewufij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467004/normal_602496397057f.pdfIn PDF document text
    • https://cdn.sqhk.co/venebavor/gfEjjX9/podalidifexosuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6013b1688fb22.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/jeKhfgc/72352264876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/49031582102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d2d5cc-939a-48fc-94cf-f714a05016ff/how_to_write_a_comparative_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27aee1de-6fd1-4fba-9764-330d55a3d3dd/jimikoredafafowowidig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af0d651-95b5-4930-89c9-5220ef96c51d/53_bank_open_saturday.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 46664 bytes
SHA-256: 65e8d086d7bf3978a0d00d763713217d00157474e9778b5ed6ab227d17b84899
font_01_sfnt_off0001768f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1768F 4964 bytes
SHA-256: e5de217f78c643968a452d112f76e2714d33f98e8d43913771515be8389d5b71
font_02_sfnt_off00018749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18749 10912 bytes
SHA-256: 29bb0315353a3c391a5f64de2106a08d0842fadcd80c759e507fd3ef236d1786
font_03_sfnt_off0001abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB5 16192 bytes
SHA-256: 4682b72f2afa33b20cf875d84024ffdd6778cb348d5560ed491e7fe37e149525