Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d82bc54c0d75c7…

MALICIOUS

PDF

70.7 KB Created: 2021-04-12 05:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17f7bb1d912067943291bce92241e143 SHA-1: 22b6805ee5a5de1afc1dcef64cc4992c69f3ea58 SHA-256: f1d82bc54c0d75c78cc09b91205a8750734e74accdc8c90b12fc781d67ea1475
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The document body, though heavily obfuscated, contains references to downloading books, aligning with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=baixar+livro+o+alquimista+pdf PDF link annotation
    • https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/c76572c6.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/687a97fc77aa.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/1867978.pdfIn PDF document text
    • http://petersikdar.com/60768130116c57w.pdfIn PDF document text
    • http://freshka.fun/fast_font_free11mc5.pdfIn PDF document text
    • http://capridigi.com/duvoliyx4qq.pdfIn PDF document text
    • https://muruvusi.weebly.com/uploads/1/3/4/5/134598427/muxijirolu.pdfIn PDF document text
    • http://dorightunion.com/adoration_prayer_book57x09.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/xotiwomaroz.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/pepipokaxunulifixid.pdfIn PDF document text
    • http://top-shop-store.website/clinical_guidelines_in_physiotherapy_practicei44m2.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/gotaw-jirukuzerazi-xogevatuta-dexedovatobe.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/dukugovevizodorom.pdfIn PDF document text
    • http://freds.space/applied_economics_senior_high_schooljlxlv.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/laratinomar.pdfIn PDF document text
    • http://kinorio5.xyz/briggs_and_stratton_vanguard_18_hp_parts_manualsb0lm.pdfIn PDF document text
    • http://nubolutlion.xyz/83990946445ce81p.pdfIn PDF document text
    • https://nofawukamo.weebly.com/uploads/1/3/5/3/135347109/wedeleg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/732a6f05-966c-4619-bce7-c943c2338792/totifuxoxirowizam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04f1be2-ccab-49d6-93d6-aef2f782229b/17574684898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592306ab-1299-44e6-98dc-ff5544031719/52496004126.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5488 bytes
SHA-256: c39379fd5354827852656c84855cc7f964ae453c9b8bc2c204e80113bac667c7
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 12668 bytes
SHA-256: 9cfd6d320c53d160a76c161f5f4f4ed3d273e2aa0279d1f4b3056b99b48f25f8

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