Malicious PDF — malware analysis report

Static analysis result for SHA-256 169cbf2e9706f837…

MALICIOUS

PDF

86.6 KB Created: 2021-06-10 03:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c69891a80f3b614c76ddeb10edb3386e SHA-1: ee487bf6f5fc822ca86e64b484fde1d37497a369 SHA-256: 169cbf2e9706f837ed4821a97c853e483c0bfd09b3639125b3158b7212457cfa
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's part of a larger malicious operation, potentially using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/pbw?utm_term=wall+hacks+for+krunker PDF link annotation
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/8daccfc442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6017447bdb8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_600ea19be695e.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/3615969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600e78e5877db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_60225e5c7a5b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fdd06d33c7af.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/fiborinurupu.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/sunamokuvigamep.pdfIn PDF document text
    • https://kululukeju.weebly.com/uploads/1/3/4/3/134371963/04c76.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/6b7a4374aac.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/3166760.pdfIn PDF document text
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/zexawikajewigowenod.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/kipesapiku.pdfIn PDF document text
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/rutelati.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/xomimiw.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/runobefineguz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424437/44774331479.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/the_interview_1998_explained_reddit.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/beauty_and_the_beast_violin_sheet_music_with_letters.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144572397/how_do_you_unclog_a_blocked_salivary_gland.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/hindi_actress_rekha_biography.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_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 5048 bytes
SHA-256: 472fa001ec012791f0469e86f185eea2e2a53f7a28774665373e13233fff8465
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 10656 bytes
SHA-256: dbb0d82a14d4094a3862734380580ec69e946453eeeb4dbd7c17bc0136119dca