Malicious PDF — malware analysis report

Static analysis result for SHA-256 4721df827f8c5252…

MALICIOUS

PDF

79.6 KB Created: 2021-06-02 04:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f98098133c2c41dda0370cdfaaa8c5b SHA-1: b9079a04cd28f66fcafdbaf38e7ccd4b1bdafe83 SHA-256: 4721df827f8c5252d36f79eb8497168fea62a1a7993d96a062b42338fb1a8d9c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users. The document body is heavily obfuscated, but the presence of URLs and the link farm heuristic indicate a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/123?utm_term=air+raid+siren+ww2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5ffa30d04a32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_6010465974a6f.pdfIn PDF document text
    • https://bigasena.weebly.com/uploads/1/3/4/7/134725946/ratunewed_tadedoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff8915c311d4.pdfIn PDF document text
    • https://noxazevoda.weebly.com/uploads/1/3/5/3/135348256/667150.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/buvomubise_vevidofowoz_josogu.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/13fd55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fe6894494589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_602479b77df40.pdfIn PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/609179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5fd9f4eb3562f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fdb67832f01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_605b1acf2e9a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepupifob.pbworks.com/f/kumimejatekulakoxulo.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/93479878790.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426576/58633489548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae03a03-f283-441d-b69e-eca24e39325b/pathfinder_2_playtest_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08a6c04-7b00-4bb7-b45c-57b99d757b53/what_is_the_enochian_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b891bd6e-3310-4b40-ab3a-ff720051bb0c/whats_the_most_ugliest_car_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c9923f-7fce-4c86-ad91-12672dee9d5b/calendario_puebla_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955ebab5-a29b-4025-9aca-844aad0aa2b8/kelavabolafopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a85f70-cb37-4966-80c2-32d81faf43e3/99423672381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b60594a-1414-4032-b901-c307a81df2ee/shadow_and_bone_books_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931bc0d0-d9b3-414a-bd35-234ef6d49aad/86296803702.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/zaborakukolus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61071977-18ee-43e6-965d-4f881cdfcb6f/9615871097.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_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 5000 bytes
SHA-256: 30a1f70a2516de1c11bf9afd4b604aaac96614a149ba36a0803d4498fa5992e2
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10648 bytes
SHA-256: f31193e2ca6361a30b6ca2e73a7d79bf582f4664d9a02cc7bb52f7817d1d400d

Open this report in the interactive analyzer, or submit your own file for analysis.