Malicious PDF — malware analysis report

Static analysis result for SHA-256 377032fc447a3aef…

MALICIOUS

PDF

70.4 KB Created: 2021-01-20 15:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c1b7acdd05778d80832cae040c888482 SHA-1: 75a48a1c4cd3b58ab8849366fda75668742fb276 SHA-256: 377032fc447a3aefb701d41237cc62b07b73a533dcba8b628b24b005cb50ed7f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to external sites.

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/123?utm_term=dmv+manual+en+espanol PDF link annotation
    • https://cdn.sqhk.co/jebumujo/LFsjbig/my_bitcoin_address_btc_wallet_is.pdfIn PDF document text
    • https://dutulizat.weebly.com/uploads/1/3/1/4/131436991/dabofozedipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5ff511f6a574f.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ig0hejh/catfish_movie_angela.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/hangfy2/amtrak_coast_starlight_roomette_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5fbcb24d78c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_5fd645e026e82.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/Rigjgmi/legumoji.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/6487836.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/kikagemipebuva.pdfIn PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/rolobod-zijexefova-gedunidokukaf-lumotixaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://segidamilezuv.epizy.com/kezewirib.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/90938270020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 4680 bytes
SHA-256: 9a0d892130b0950e1e445e5ced17a66021f123c011b66928b2781d0fb7ee75d1
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 9748 bytes
SHA-256: 629b12840c66ee1d195bbdd555064603e0fb03e8fd61adf166643d5ae7519d3b
font_02_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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