Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4a4c04450ea3f7…

MALICIOUS

PDF

75.8 KB Created: 2020-12-29 20:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1a2055d52fea15bc42db1e908e6935d6 SHA-1: 7665fea908ceca4409d2d2701ca46ebfd49ce7dd SHA-256: 3b4a4c04450ea3f74448fb559042977ef59b6f91c4987403f96b9ef28c847a5e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing 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://trafffe.ru/strik?utm_term=aaron+rodgers+family+controversy PDF link annotation
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/7525986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fe06a9cefe28.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/bjhfgd4/56531838512.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/telilo.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/xRhaAyM/wibavazutilogemege.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/4186570.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/jjififb/91319214606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5fcd25608e419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fcca85725a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fad698877a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5fa2db7b04dea.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/8991076.pdfIn PDF document text
    • https://sexegunu.weebly.com/uploads/1/3/3/9/133997610/dovitikodek.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/diwuresupejiwad.pdfIn PDF document text
    • https://melozepopi.weebly.com/uploads/1/3/0/7/130775643/2d7d780e3cfa7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5f90b199a5a57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5492 bytes
SHA-256: 4dd54ce6dfad6791c3aacd9dd9ea4f10b5dd5072fe5ccce3a7913e8fee8dca30
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 11684 bytes
SHA-256: 5eaa15b6a4909642b2bf51a2444f02c80bbaa4d362e389e1f8f8761a42d01dc8

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