Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cec3120d4b57497…

MALICIOUS

PDF

73.8 KB Created: 2021-01-19 07:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6663c262a4d8c0f8ee64e78fc9db91a9 SHA-1: 1335a33f10f38f7c14214401d86c3724bb2d4497 SHA-256: 4cec3120d4b57497ff060bd6db8c7e4f2ef6212884e6e33f070a7a2b059e6cd9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to reference product details, likely as a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=philips+dc320%252F37+for+sale PDF link annotation
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/zeziwuduxolu_lokarudoguren_dijojimi_tifudo.pdfIn PDF document text
    • http://xudisoda.66ghz.com/33275185195.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/2438645.pdfIn PDF document text
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/4943853.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/8cb41fe072.pdfIn PDF document text
    • https://cdn.sqhk.co/lezubenewago/flCjgig/craftsman_tool_box_lock_parts.pdfIn PDF document text
    • https://dejizova.weebly.com/uploads/1/3/3/9/133986792/pojud.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/jbMBijf/sibilokudirasuvafopuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/bhdpYvQ/velodyne_investor_relations.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/4454170.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://xafafomuripag.epizy.com/92019164595.pdfIn PDF document text
    • http://fabonek.rf.gd/wefurukulikel.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/zaxigubodusegoxamomu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 5400 bytes
SHA-256: c68e86ac3a9a9ce9e2e0625cd9980050a93d4c9cc75db715e2615e6fdbdc90c8
font_02_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 10908 bytes
SHA-256: c1173c71a4413caae23507886c1e31c66808dcad0d934efbb3af165efc3b3fca
font_03_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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