Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72d5f04c0771936…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 08:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e1606d56e4ac759da137da69df00b80 SHA-1: df5ab5ea5a0dbbbb1e8928cc0de129fad7fbb227 SHA-256: d72d5f04c0771936d77bb9e002df0c7412c5f4c162ee68673d3334fe0abf3f98
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/123?utm_term=baidu+spark+browser+for+android+free PDF link annotation
    • http://kopolebukerone.iblogger.org/47373651817.pdfIn PDF document text
    • http://davavemoj.66ghz.com/mustache_template_if_statement.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/ogjhjje/lemuxuxukivuvibojob.pdfIn PDF document text
    • https://cdn.sqhk.co/kefiruge/iFgcgVL/best_price_ninja_coffee_maker.pdfIn PDF document text
    • http://peraxulamo.22web.org/bafibazoberovijejuwusosuj.pdfIn PDF document text
    • http://sunazuwu.iblogger.org/basic_civil_engineering_interview_questions_and_answers.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/assembly_language_programming_8085_tutorial.pdfIn PDF document text
    • http://vopukisavenif.medianewsonline.com/zilexawow.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/41291965404.pdfIn PDF document text
    • http://sapiwis.iblogger.org/digitalisierungsstrategie_bundesregierung.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jgjhfhj/17869293405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajokaxakubif.rf.gd/55507016664.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/gojuvinoned.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_87c40e1326444485a04881385fa896fb.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/lafebusizewonapuma.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/vezefifofumifej.pdfIn PDF document text
    • http://zerozuru.epizy.com/bogoroditse_devo.pdfIn PDF document text
    • http://gatezuzemup.epizy.com/difference_between_induction_motor_and_synchronous_motor.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/metastase_ossea_cancer_de_mama.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_f5843840e2e84521876228d0e4e549cf.pdf?index=trueIn PDF document text
    • http://risuveliki.rf.gd/puzaje.pdfIn PDF document text
    • http://zasidad.epizy.com/cain_and_abel_for_windows_free.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_238e6efd31c945e388cac23636d981e9.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_31e21fa0fb414c5c962ef0b2fcf0d3a3.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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5348 bytes
SHA-256: edaf8cf06c93c79dba61fcb89d052a8257e6947d77733ce31841536257c0cea4
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10908 bytes
SHA-256: 2ba5634f6ffb5582debc82508e22b776beef9e9d4d01f8efad57e384bcf4a728

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