Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cc90396a6ae0e4…

MALICIOUS

PDF

67.7 KB Created: 2020-11-09 19:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8f0c9f088fce3fa49d037ffbcc1fb8d2 SHA-1: 5e8b2de96fb40c8bc623ca793d6acfbb46feaa23 SHA-256: f3cc90396a6ae0e49e7d0633c5a1e4ee38e689d8aaaa7e00a944a95389c1e2d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and an ML classifier also flagged it as malicious. The primary purpose appears to be directing users to a network of potentially malicious or spam-related content through these numerous embedded URLs.

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://traffset.ru/aws?keyword=current+french+men+tennis+players PDF link annotation
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/xokizifud_pixupezut_xexovo_vaxemadetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f920faf528ba.pdfIn PDF document text
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/c7d52b81.pdfIn PDF document text
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/gowesitapul-dajigo-kevaziwuju.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/vojufe_wajarozadazi.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/zutixurivawobilif.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/dabado-wemexipida-rojedipifunojuk-pufixewabo.pdfIn PDF document text
    • https://kezojafedekekav.weebly.com/uploads/1/3/4/0/134096401/tiwilu-ruzagewelu-gesitidagovide.pdfIn PDF document text
    • https://sogenaluvejor.weebly.com/uploads/1/3/4/3/134328850/674245.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/rewig.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/bogajip-febub.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/jiwibad.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/vovuzize/habit_5_worksheets.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_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 5260 bytes
SHA-256: 4be73b1b1f89ec981448f10dfc03ec9901412d20a4ba74c99b8af1992200b6c8
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 11828 bytes
SHA-256: deb7e725207e4a2496adf54eae6b1e38fa540556d0c7c147c0d30ef2a9ad416a

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