Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea4fc23ea33867f…

MALICIOUS

PDF

102.6 KB Created: 2021-04-24 00:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bb00de6dd570d6a0e57b9f3575432e70 SHA-1: c12d4a9d12272fb19361645ecb77546d2f5e9e40 SHA-256: 3ea4fc23ea33867fc87c6bc3bd5a4f76edc2930163a7fba3b2bf80445fba4487
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically flagged as a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were directly extracted, the presence of many external links and the ML classifier's high confidence indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dugedepap.ru/strik?utm_term=mercury+25+hp+2+stroke+manual PDF link annotation
    • http://testersairf.xyz/kakopilojirbxqwp.pdfIn PDF document text
    • http://ersoil.fun/sat_practice_test_3rxoig.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/how_to_reset_plantronics_m70.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/41320581149.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/lejifexuladi.pdfIn PDF document text
    • http://ryursew.space/english_dictionary_app_apkr0iq2.pdfIn PDF document text
    • http://persequen.com/bafonotike1hugb.pdfIn PDF document text
    • http://vijoviresole.mywebcommunity.org/catering_service_business_plan.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/xitukokuzokikanoki.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/31968016821.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/9785068144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_fb71009b07c34d1b8782a9a9e5964f65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/fruit_from_a_poisonous_tree_warrant.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_f35cdfaa163d49cfb43963037bec844e.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_7494859b765d4e31948dadee4bb4486c.pdf?index=trueIn PDF document text
    • http://dirazonun.myartsonline.com/zezaril.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_2f2e604bd25e4acdbe587ba8f6364e19.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_79b0aaaa828a4d33a184b534b4fe1469.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_eb760b06410d42598e7257b88d72a6ab.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_282e5f373a424406874edd10b9e9ebb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/b_braun_infusion_pump_service_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 5600 bytes
SHA-256: 4d4779735a1171921235f5120b6f9fc2a59291a5aea74edb628c0516542b6df2
font_01_sfnt_off00015195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15195 11192 bytes
SHA-256: d4ca2a899888ee3b09a354dbc686043ff24291feaa1c01d31967a6cad7586f89
font_02_sfnt_off000177e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E8 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953