Malicious PDF — malware analysis report

Static analysis result for SHA-256 a617b2533bfdf0ba…

MALICIOUS

PDF

72.1 KB Created: 2021-03-06 02:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cd843ac50f7b3c212a7edb5e45f5a685 SHA-1: ea69e128e6bd4edff5a90ca96162a0d6bbc8b211 SHA-256: a617b2533bfdf0ba63d273481e779eb19ba080f72552957cfdabe0558e6a2452
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic to distribute malware. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=iso+iec+27001+audit+checklist, which is likely used to redirect users to further malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=iso+iec+27001+audit+checklist PDF link annotation
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/fezetafogilubederaf.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/a4d9211d.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/9ec9abc0eea.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/can_graduate_students_write_letters_of_recommendation.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/kidafigopilozi-gezodezogozexij.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/political_science_books_online_reading.pdfIn PDF document text
    • http://juvugewit.iblogger.org/confession_augustine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekizipax.rf.gd/25542230579.pdfIn PDF document text
    • http://minivenema.atwebpages.com/6777939971.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/xesimuwudosagovafiwaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d336ac-9788-4ba8-85e0-4b542f774818/kidexo.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/canon_vixia_hf_g30_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/dispute_something_on_my_equifax_credit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b52d67-d799-4f1e-b274-f3a0135292cd/mamiya_rb67_pro_sd_manual.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/what_are_the_levels_of_reading_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/82932545817.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/hypothyroidism_guidelines_pocket_card.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/lobivudidu.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/sawivetoraluselo.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5336 bytes
SHA-256: dc64e2bd6d4d8a3dc03c5b5994b521d8b17755c419ee031385a5b2091a3591bd
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10196 bytes
SHA-256: 8d5eed0a54d1c1f579b3130a5bd65e2c9dfe0a86b7d64297c9864e9fc0d016ee

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