Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf02d3690d44b4cc…

MALICIOUS

PDF

85.7 KB Created: 2021-04-04 16:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac626573ba4510ed14bfb76ad8ae052f SHA-1: ded7b84da4ef82db77ae7fe4b04e3c15d5ea11f7 SHA-256: bf02d3690d44b4ccfdd4cf09aa61448e6f3cd8e147c5860b43c48a3239363417
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/strik?utm_term=how+long+do+ge+profile+refrigerators+last PDF link annotation
    • http://winatesef.sportsontheweb.net/the_architect_s_handbook_of_professional_practice_15th_edition_ebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fca7d3db2eb1.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/9843505.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/pozeruge-nazopodog.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/fuwusuv-nufapepowolikut.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/mevodorumulemusumur.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/98a6906389ed30.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/anti_plagiarism_en_ligne_gratuit.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/1fe0f687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601f1e9d65c5a.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/xukulevawex.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/what_is_the_role_of_social_research.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/pesibinexer.pdfIn PDF document text
    • https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/1477628a2e6.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/8000386.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/rakigabeseribilev.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/how_do_you_remove_a_stuck_tupperware_lid.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/vebenok/wiwin.pdfIn PDF document text
    • http://medexode.atwebpages.com/computer_hardware_definition_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/bonimitenofamirawupol.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_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 5260 bytes
SHA-256: f825f72914ad1e174c45bf0dde8ad4171d864b01059f5a2a0d51eb8d7d8bb0a6
font_01_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 11508 bytes
SHA-256: 1c682a6046b6c0022f4b5b9fd4969bb9375e0982b95a837709db0f434313be9e

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