Malicious PDF — malware analysis report

Static analysis result for SHA-256 683233c9dc8ee406…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 05:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: acde1d8fd8e2377386be90de6e894afb SHA-1: d20c77498908bb48717b7be2acd50b64cf8621d2 SHA-256: 683233c9dc8ee406b726fee08215fb946285591f4e0a0b065369a2346e3803ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing numerous external links to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=rosario+ala+virgen+de+guadalupe+con+letania PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fee4ac0b71c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_601672417591f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_602129a31f8f4.pdfIn PDF document text
    • https://nozuresosobud.weebly.com/uploads/1/3/4/7/134758814/b4dec0bfefbc.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/F7iaAwv/patient_history_of_rheumatoid_arthritis.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/3jeyfz3/jesafogowegimoteson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_60260b304ca13.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/higjcjj/srso4_ions_present.pdfIn PDF document text
    • https://mujekakuvegaxum.weebly.com/uploads/1/3/2/3/132303245/549640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6022a86481f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_602db17e55b64.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/how_to_work_with_a_sign_language_interpreter.pdfIn PDF document text
    • https://cdn.sqhk.co/webaxepibi/AP1jbhi/61362068702.pdfIn PDF document text
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/wepoben.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/da571.pdfIn PDF document text
    • https://kafekejanabex.weebly.com/uploads/1/3/2/7/132740445/mefunipugakupodimef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/hana_wa_saku_japanese_lyrics.pdfIn PDF document text
    • http://baxojusijopigas.rf.gd/22698023464.pdfIn PDF document text
    • http://zojuroveji.epizy.com/bonumesilutezifajedil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 5308 bytes
SHA-256: a138f5d8cfe2fb02a86df9f5fef01f0c3987fa62ae758d73ae19a76f93056b28
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 12044 bytes
SHA-256: 3672bd523eb058e38ecdac4d0142e70bdd5f324c13c0247991b696592301a68e

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