Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc44d1f23290c59…

MALICIOUS

PDF

69.4 KB Created: 2021-02-22 15:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffaa121dc718e7473c61c1b0e6742e12 SHA-1: 0be64f68a9d13fab235fd3c0b50bae27f4c676e8 SHA-256: adc44d1f23290c59c607ae8bb79c9614a04f165e0f2454de8a9b3a8e52560d1c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

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://jottigo.ru/wix?keyword=stanford+student+health+services PDF link annotation
    • https://cdn.sqhk.co/dazulegug/hMOWig0/706_east_front_street_new_bern_nc.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/1428899.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/nirufagove_givewoko_dofupo_dusavibew.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/he0VcOc/minigames_tab_rs3.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/2ea8ab952d1.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/127a00524.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/gg4MlNc/nhl_playoffs_2020_dates.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/kixizoxuzo-kanujivuvutunew.pdfIn PDF document text
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/b4d711c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5fd9064b901b6.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/ehivijB/save_the_president_game_free_online.pdfIn PDF document text
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/16ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_601f08f5cd14c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5fdee4822eb27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/39517761490.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/76353117789.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/butter_chicken_and_rice_nutrition_information.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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 5272 bytes
SHA-256: 49738de3e0c11f4ec857d35b4731b6e1d3ab2dac8e7fd9ce5383de8ef37cc498
font_01_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 10796 bytes
SHA-256: acac535f801a3f16d008295c00ce8919f66df11ab7c3163d97aebc08b1768866

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