Malicious PDF — malware analysis report

Static analysis result for SHA-256 756269b90ef84816…

MALICIOUS

PDF

85.9 KB Created: 2021-01-02 21:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25e7f7586cc89ce5f797091a5839e490 SHA-1: 71f66b6beff34714e2d45aaca885334243b2cbb2 SHA-256: 756269b90ef84816bd9c1ae265fec5ab77f8cf5ef4b4499ebcd3295f46132977
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 domains and hosted on services like Weebly and Strikingly, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs suggests the document is designed to redirect users to potentially harmful 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://trafffe.ru/123?utm_term=vikings+burial+rituals PDF link annotation
    • https://cdn.sqhk.co/mugejufunij/icHupcE/47536222743.pdfIn PDF document text
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/nazakamu_lilarifuwoxi_zunal.pdfIn PDF document text
    • https://veledagovivavav.weebly.com/uploads/1/3/2/6/132681602/gesapuj.pdfIn PDF document text
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/5393457.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/1328725.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/Ghhejbx/wubomoxugagafugu.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/ghVHujb/nick_jonas_wife_age.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02912d59-1b40-43c1-80cd-cb7e2593241c/wepokutawajutijozinesew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b547d3-44fc-4603-9c91-0f2649442d0c/todapadobaduzemedud.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/light_worksheet_elementary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3631a706-0161-4fe8-a420-affd6632cde2/legotadipofogofibar.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/beguwiboxazupuniluwatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44bd560-ace3-44af-9202-1373505667b7/95101085681.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_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 5020 bytes
SHA-256: 573bc3535b6aa42a8e52e480ec3a4299738adb2978d50eaefa8c3180bccf0d68
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 12380 bytes
SHA-256: 8b25735ab8ab2aec79108e2b92a595596b2e23d7776ffb6644450620336b529b

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