Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ec0e7b122859ed…

MALICIOUS

PDF

72.8 KB Created: 2021-03-14 23:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4169cc15b43f870e43d741d8bd82f010 SHA-1: dd47c6c0820ac9f0747df467a318bd0aa99f7a58 SHA-256: 71ec0e7b122859edc7b932ccb16e46b71496bf487fa5484184d42cc3972e1ad8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL pointing to a keyword-related search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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/wix?keyword=dna+structure+concept+map+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468838/normal_603d294476231.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/7736685.pdfIn PDF document text
    • https://poguxepo.weebly.com/uploads/1/3/4/5/134509835/d5a14d9b7309a.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/turiwawimofepavotof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_600e5d3e0f5b8.pdfIn PDF document text
    • https://zetivesitufewe.weebly.com/uploads/1/3/1/4/131438305/josabam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ffa15a2a6af8.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ahbigit/grow_zombies_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5ffe2149568b0.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/2NjcRgh/misifajuxufonagazoraxe.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/jAJpK90/genetics_from_genes_to_genomes_free.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/43494fdfcdc228.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/bomifabipi/64287782739.pdfIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_d2116ea780bc4e63b92a491c02a8b12b.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_252fe29711274d0382d0254a4788a910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/fexugiwupebarusupukidi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/ruroliwuvomijudowag.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/toto_washlet_s550e_manual.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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 5136 bytes
SHA-256: 8bfcae668a710bedb5b4da5589822fe10db59700e8ce34589ca417e1d94d2403
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10680 bytes
SHA-256: 7267cb5191c40b5dc9254bc346024e57388dc13a79e0602ca7c865f64aed0fb4

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