Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78d1aa01ea8a1b7…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 05:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e82c249dedb3e9f98583dd5c5b872aa SHA-1: 7cc0b1e1dba38e8bdde64061f0f3758c459cef3d SHA-256: b78d1aa01ea8a1b78cd039e0844e47a961747b3f6fd8a37765b107e822168a51
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads or redirect users to malicious websites.

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://zajinet.ru/strik?utm_term=which+jack+reacher+movie+is+first PDF link annotation
    • http://carins.info/gorirelatajz0183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406208/normal_6006ebaf716d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_605d84560233d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5fec65adc4d6f.pdfIn PDF document text
    • http://paypallsecurity.com/troy_bilt_generator_3550_fuel_tankz2xn1.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/mediaset_premium_guida_tv_calcio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_60565b4f03081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_6043fdbc6285a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fd2e170e56ee.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/jbcc_nominated_subcontractor_agreement.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/54da0c52-afba-4f86-bffc-be2d2a4efb05/crosman_1077_mod_parts.pdfIn PDF document text
    • http://sikopaxewuxiju.rf.gd/64448821260.pdfIn PDF document text
    • http://kexeban.rf.gd/hollywood_movies_free_hd_quality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61d430b-1bbc-4e9d-8d2a-11dbcf328766/74299544482.pdfIn PDF document text
    • http://babazemo.epizy.com/hitchhiker_s_guide_to_the_galaxy_answer.pdfIn PDF document text
    • http://gulavofi.epizy.com/91542159896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf0939f-a603-46a4-af13-88ddeb40c5fa/how_to_work_out_iv_drug_calculations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce96277-94ad-445f-972e-077087ee4832/jojevafojukitikegad.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_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 5304 bytes
SHA-256: 03527bb83c86e85b2a10ff60662d08f4bc629c65aa0f7bae4150d46e779b1b1b
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11852 bytes
SHA-256: cdc629627b1ece2d5207391967dd4e8e82c26b406e3fa8e78c17ce0d45238284

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