Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b97da3e1ed4e609…

MALICIOUS

PDF

80.7 KB Created: 2021-02-24 03:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8f008e6263ffc98224619d62a5898ceb SHA-1: ffd8028898870026d13473e9b9d38186c1da532b SHA-256: 4b97da3e1ed4e609850c1596127f41d15f838feaab382767e0c15784b2c46dd5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=honeywell+th9320wf5003+user+manual PDF link annotation
    • http://wiruribadusa.iblogger.org/78481655670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6020d09830a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_602cb286a5cf3.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/ahaidjd/73290201606.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/geMK4jb/high_school_basketball_free_throw_line_length.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_600aa0c73915f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5fe1f62d7a6a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404529/normal_60065a35bdba3.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/7Oy2Vjc/twinme_private_messenger_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_602d4a763dbff.pdfIn PDF document text
    • https://rodubimalutavos.weebly.com/uploads/1/3/2/6/132695690/duziwoxozidorit_xodidut_kagurelune_nipibonomodolu.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/Qjigiga/litupamapizepaxoliwubev.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/a352eb8138b9a8.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/sojanadujoxenilew.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/bb0gCjh/lemon_box_simulator_for_brawl_stars_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mabobasator.epizy.com/najisedisag.pdfIn PDF document text
    • http://zitegarapopufis.rf.gd/vexidosakogiverugos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 5880 bytes
SHA-256: fea0e190ba848e4c5846673bbc21352c4c2774a96157469303edb2661b75f6a8
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 10660 bytes
SHA-256: 9e09d1fce6aeef3b86cd85453da4c7b006704663915bb90bec2d2c0699aaca75

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