Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcdf9a6a91518d1…

MALICIOUS

PDF

137.4 KB Created: 2021-03-16 02:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9212763b1b8c72e0705fc70876df3fb6 SHA-1: 9c4c6a2da4c2e683f7bf063524253fdc112fe05c SHA-256: 4dcdf9a6a91518d175ed409e4adccc42ff27cd06cc0b5eddedabc2077fb41d6e
146 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs and utilizes a link farm strategy, with many URLs pointing to disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, which aligns with the link farm and redirection tactics observed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vilenefex.ru/wix?keyword=jedi+consular+questions+kotor PDF link annotation
    • http://juzawav.iblogger.org/conair_1875_double_ceramic_hair_dryer_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5feb5d1bebe36.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/2njfnih/behavior_intervention_plan_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5fd06762e8556.pdfIn PDF document text
    • http://vuwubuwo.22web.org/59052596350.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/jeojbib/infographic_resume_template_word.pdfIn PDF document text
    • http://xomuxeje.22web.org/dawodul.pdfIn PDF document text
    • http://badge-verification-center.com/bakobz1grn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcf313a906e2.pdfIn PDF document text
    • http://jobauthor.online/80889476153jbjvq.pdfIn PDF document text
    • http://natiral.space/blue_is_the_warmest_colour_movie_download_in_tamilyogizqk75.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/sloth_from_zootopia_in_carhdpco.pdfIn PDF document text
    • http://bazis-rostov.com/life_insurance_buyer_s_guide5mli8.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/2ibujfQ/37612967067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5ff9ac4b64472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/geraxajuxodudepuwa.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_0102af3e91eb433db994dc573402f22e.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_78f6840fd56f4e6595d13ae8659a1a85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/age_of_empires_2_macbook_pro.pdfIn PDF document text
    • http://kopinakitiwodad.rf.gd/1894629004.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_7d3d492227474253b76b75d5d5908415.pdf?index=trueIn 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_off0001e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E194 5112 bytes
SHA-256: 3c2dd49c51d88a6d69d70bbb7fb4df60ef357209e92e3dda9c5abb3d850ec018
font_01_sfnt_off0001f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F309 10672 bytes
SHA-256: 0cee226c9a0bf998780cc071a7fdb75a2c95e7e1b7374cbf4d454a580bd287dd

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