Malicious PDF — malware analysis report

Static analysis result for SHA-256 1631575d36c9d4ae…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 08:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 548eb2caa463d401ad803a8c7cdf256f SHA-1: 87072f02e3bdb0e5834671a13aaf5beaa245447a SHA-256: 1631575d36c9d4ae189afd31ca714805922867304ba3d9ba5638df0a6eadec44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=airline+management+system+project+documentation+pdf PDF link annotation
    • https://cdn.sqhk.co/soziwariru/jbjejcb/scary_teacher_3d_ki_video.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/KLdgjtI/11291396457.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/Yifihgd/kewifa.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/devizofivabi.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/837a3050cda.pdfIn PDF document text
    • http://erethiztzj.space/mukikewumebadimapi2qknq.pdfIn PDF document text
    • http://aydym.club/kitiretonexx4m2.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/2275561928.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/vorufew.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/libidafafi.pdfIn PDF document text
    • http://eurofamily.pro/phrasal_verbs_con_getckmh2.pdfIn PDF document text
    • http://vorgazme.com/raruvevabo9aac.pdfIn PDF document text
    • http://saveyoutubebot.com/how_many_english_irregular_verbs_are_therebnd6g.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/gobiluwuwu-vuwurede.pdfIn PDF document text
    • http://presentinsta.online/266003929048cs89.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/53217993618.pdfIn PDF document text
    • https://ridoduna.weebly.com/uploads/1/3/4/5/134528127/62be10afda4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_91caa0334eec47f8a9dae9115051ba12.pdf?index=trueIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_b5f877ca985547a29450662b2422c4c0.pdf?index=trueIn PDF document text
    • http://vidilig.onlinewebshop.net/jofulomidobimiwilegif.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_486bf013735b4d93b6fd1a6e98fb85bd.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5644 bytes
SHA-256: 4772360bae8a36b729c3661a10eea66e2e67705e96a9c11d141a455029b01e48
font_01_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 11384 bytes
SHA-256: fee42ec739143b94da4985f91d04bdd1d67d68f42612b74529fbffb5677ea86c

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