Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6675ff9f1c0b76…

MALICIOUS

PDF

74.0 KB Created: 2021-04-08 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eeb69d7a4cf5858261a090e86fe8ecf7 SHA-1: 11b895d614e1bd55bc7150ce877f84fd0a180f99 SHA-256: 8f6675ff9f1c0b7693824c160834bc2b0e3a6617c214e7b11fee8d124012cce9
186 Risk Score

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 0.9999

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://dafemum.ru/strik?utm_term=statistics+for+psychology+review PDF link annotation
    • https://cdn.sqhk.co/ruvonusebex/JhhskK1/viridiana_name_pronunciation.pdfIn PDF document text
    • https://cdn.sqhk.co/mabuviko/lYmhahf/plants_vs_zombies_2_game_unblocked.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/didoxaxip-mukafifezemobem-kadurezu.pdfIn PDF document text
    • https://bojemoravegoda.weebly.com/uploads/1/3/6/0/136095552/xafokerarufefod_xulebitimu.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/puntos_acupuntura_para_adelgazar.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/jejezororabeke.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/jizedeju-bukupatev-petoxatabosife.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/m0ia8xO/arizona_shooting_competitions.pdfIn PDF document text
    • http://tobafoxapupudug.iblogger.org/47791614024.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/Ziahgge/rivensbane_destiny_2_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/GiihcjA/my_story_app_parent_review.pdfIn PDF document text
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/nutovobunivitisat.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/4442519.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/67905859986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawemitop.epizy.com/absalom_absalom_download.pdfIn PDF document text
    • http://fusezumapaj.epizy.com/pisemuzewaxotekijanuwega.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/48644627244.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 5636 bytes
SHA-256: 5b55f4376b4023d087c4dfb4a35f4b67df415c7024e39f058ef2964ca5f0496c
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10556 bytes
SHA-256: 79de9964b4fe5c27d864cb2552d984d4b37e7a1bb4d7c89d38708b5680c5b6dd

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