Malicious PDF — malware analysis report

Static analysis result for SHA-256 274228522420f7c1…

MALICIOUS

PDF

72.9 KB Created: 2021-04-22 08:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0fba648f3eb26c6843c2eed8c234bf21 SHA-1: f805f94ee8ca322df5be85f81a3eb10ebcb1e4cf SHA-256: 274228522420f7c10e57fd6377c9d74b1438e930757568a8b58b7950b5d9c90e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+make+hip+hop+beats+on+fl+studio+mobile PDF link annotation
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/5e6fd2e335.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/kumemuve.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/FFjhgfQ/warriors_of_the_eternal_sun_genesis_rom.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/anemia_drepanocitica_pediatria.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/aspergillus_fumigatus.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/xatagesejixarerajivi.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/6487476.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/eca143f6-0375-4146-85d7-122133f27f76/meade_infinity_70_telescope_accessories.pdfIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_c5a6c9ac94f24c5889e8caf00dd4ede4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5c5bb0-950a-442e-a943-b0451fee4ce5/piguvozorunenafuvofav.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_cd4250ff962a4b1c9e8c922c003ebfa8.pdf?index=trueIn PDF document text
    • http://wukevivetarapu.myartsonline.com/algorithmen_und_datenstrukturen_die_grundwerkzeuge.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_4233e315a96443f6bfa22334b080e0e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8696866-fd10-408e-aadf-ce5d5deca4d7/what_are_some_examples_of_biomass.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_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 5440 bytes
SHA-256: bc728b89f81a65665dadcaf3bea47721a06f367ee1fea72945aada1af059635c
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 11000 bytes
SHA-256: 81b3e7c89ebb48f42c076787c919e9778d98e3d67dc4ec0d1410a7a00f5fc092

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