Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe5f0d8f431d08b…

MALICIOUS

PDF

70.0 KB Created: 2021-02-12 00:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 111c404e11326f49dc5d0fb2387222e9 SHA-1: 6cd47e37c523890be2322c08db7481d5eebf7afb SHA-256: 1fe5f0d8f431d08b4fafe35b8acccb6f6722753f3cdeb2dc57c224a713bffcb5
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wb?keyword=crockett%20livestock%20market%20report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470231/normal_60158ae483a4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_6007dee930a10.pdfIn PDF document text
    • http://dinetaki.22web.org/khatrimazafull_bollywood_movies_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_600f26dc5d001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fca6d3a53e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_60129579163ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fda1b2fab773.pdfIn PDF document text
    • http://davavemoj.66ghz.com/jeopardy_powerpoint_template_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5fc7cdc4f3f22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5feeb5f7a86d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://masusekokuberex.rf.gd/automatic_transfer_switch_manual.pdfIn PDF document text
    • http://renawexit.epizy.com/c_sharp_oops_interview_questions_and_answers.pdfIn PDF document text
    • http://dodadugiwajazar.rf.gd/renaralonosalatofumexi.pdfIn PDF document text
    • http://tiworetaganufo.epizy.com/futevuxetego.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 4908 bytes
SHA-256: bfe54476ef0f6f7fdfff2bf6868837eed8752f0673cdb26aa43213bc6279be52
font_01_sfnt_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 11020 bytes
SHA-256: 8a76e66a3820d7d8ec2473faead6a1761ccfccbed6a940b2241204dd78cf2640
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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