Malicious PDF — malware analysis report

Static analysis result for SHA-256 73422dac3cbc6647…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 10:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87d4b3ef2e274d25e7868a3af3394389 SHA-1: 997ca5f5c9e3f6148ee04241c5c7639e934fae25 SHA-256: 73422dac3cbc664737873f92a2914590b68afb11641d748e412d62cc8db81b4a
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=william+rodriguez+linkedin PDF link annotation
    • https://xutagevobufoj.weebly.com/uploads/1/3/1/6/131607169/0a5163a.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/25125500171b3ewc.pdfIn PDF document text
    • https://vawixufedal.weebly.com/uploads/1/3/0/8/130814584/zuwifa.pdfIn PDF document text
    • http://richteam.site/naming_acids_practice_with_answers6yxas.pdfIn PDF document text
    • http://hookup671.site/64241960233048qx.pdfIn PDF document text
    • https://gazipiserit.weebly.com/uploads/1/3/4/8/134883514/5413578.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/tesogubab_wixat_xuzelugi.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/9225444.pdfIn PDF document text
    • https://bodonoweti.weebly.com/uploads/1/3/1/8/131856710/4c1cf8b15.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/4846988.pdfIn PDF document text
    • http://inostrana.com/wuwimagavuzibuxulifaxe7ajri.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/kowowinine.pdfIn PDF document text
    • http://tiktokfrance.fun/kamawa1h451.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/4518699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_eafd5b3bba894bfea20a6ba17475adc1.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_820f08a38ab649eab71b3d6b978a6c4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/44218397407.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/art_style_challenge_template.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_25df597ca2cc4d17a4c0663d763c2824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/video_cutter_online_free_without.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/94719053027.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_aa53c532ecdc46fbb8a70dd05abee3c9.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_2ae5a7361158486297ed5f67b8039f39.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 5096 bytes
SHA-256: 944366bed8ecc9ca8792b2f585705f017cfd2934b3cd29157290903baa6cc82f
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 12496 bytes
SHA-256: bd5bc612d2865f043608da150d5c53d52707f2c98075651deb6f9896a9f6ecae

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