Malicious PDF — malware analysis report

Static analysis result for SHA-256 485cf0ed523113c2…

MALICIOUS

PDF

73.4 KB Created: 2021-06-05 05:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b4501597d4da4de0e953ac78dae1f820 SHA-1: d64e64ff6b677c6c2f1326c6a3a4783d43207e92 SHA-256: 485cf0ed523113c2a0137643385808d6f4f805b29d88b395afcb4d356d4f17eb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, forming a link farm designed to obscure the ultimate destination. The primary URL, 'https://drafthe.ru/pbw?utm_term=download+google+chrome+zip+file+for+pc', suggests a lure for downloading a file disguised as a Google Chrome installer. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://drafthe.ru/pbw?utm_term=download+google+chrome+zip+file+for+pc PDF link annotation
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/fukilutulesasojutola.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/8d3c927b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421783/normal_5ff45ba53590e.pdfIn PDF document text
    • https://wogaxorabamogak.weebly.com/uploads/1/3/4/4/134400234/dovodavel_vuzojerimo.pdfIn PDF document text
    • https://vizavidonase.weebly.com/uploads/1/3/4/0/134040461/dekinoredutopu-nozisuxetomul-vidilupemepaleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6011ae63d7726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_60635de9bb288.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/deginoj-lerebifog-jakokufofotulal.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/badat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5fdf56444a06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_6069c8046f5b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144576504/7_rings_piano_sheet_music_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311956eb-9db1-4956-95a3-c5673aa625aa/baby_girl_pram_shoes_3-6_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd52971-1a36-4b6e-9fb4-e8d157cfc037/26715452362.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144457578/td_bank_routing_number_for_wires_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63ca2f4-368f-43e9-a264-6d8fefbf4886/numaberuponozovikononu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543ee350-12e6-4c5f-96bb-5029689324aa/40478807021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9679bc2-9c90-4c11-adfe-696435a45fdd/rawuditomijejevubonijake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e005ec-26d8-4290-89e0-f438213558f1/20199317666.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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 5532 bytes
SHA-256: a7e98c872c457957687e97163993f09f85c19a3fe12b085d46751494a9dc4f3e
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10616 bytes
SHA-256: de41e49bb206df9bb9c96b2cd9939722b28e86a3b38f81916a9b873faa59efd7