Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa688428c7e4340…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 11:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2ba9bff53bebd983f7d3d77faaa440 SHA-1: 1d33f430e0c9ccc218c24162f8560e0795e7332d SHA-256: efa688428c7e434083fe5ac1950d5717ae72de2c160b1ae5793adb8595aebceb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=bridge+to+terabithia+unit+plan+pdf
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5fef347a266c8.pdf
    • http://doporujela.iblogger.org/filunulaxemedazaz.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_5fe6de6527c65.pdf
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fe2367ce89eb.pdf
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fe7136b6895a.pdf
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6034ce4e42781.pdf
    • https://cdn-cms.f-static.net/uploads/4483388/normal_601b24ff6a5d4.pdf
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/fefewiwoxif-xokerit-zozesodoxaz-jivigukufugobob.pdf
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fcf743d082c7.pdf
    • https://tijoramamuguko.weebly.com/uploads/1/3/5/3/135390581/wosadexenofijebatus.pdf
    • https://cdn-cms.f-static.net/uploads/4466364/normal_603eae4c289b9.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/4367448.pdf
    • https://cdn-cms.f-static.net/uploads/4458635/normal_6035f5c35ac35.pdf
    • http://sevotapapi.22web.org/budget_speech_2019_20_pakistan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fasilew.epizy.com/hpv_treatment_guidelines_2017.pdf
    • http://dupumimegijema.epizy.com/bugotusuboti.pdf
    • http://kunerev.epizy.com/answerable_question_reference.pdf
    • https://uploads.strikinglycdn.com/files/82459e4b-4b10-47d2-9035-e767814db483/briggs_and_stratton_vanguard_35_hp_parts.pdf
    • http://vunatavinede.epizy.com/67420924993.pdf
    • http://sufelubunat.epizy.com/5060132767.pdf
    • http://gonoxil.rf.gd/laxujotetogobesava.pdf
    • https://uploads.strikinglycdn.com/files/7435b70d-b4b7-48ba-8402-914c653051cc/star_traders_frontiers_best_ship_components.pdf
    • https://uploads.strikinglycdn.com/files/65ebbf31-b69d-46ac-8e3e-18535dcece31/96087425235.pdf
    • http://www.readwritethink.org/classroom-resources/lesson-plans/exploring-friendship-with-bridge-981
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16a.bin
c6f402d203d3b991a189aa97f139e9b870a1423a54a366623682c51572e68b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5312 bytes
font_01_sfnt_off00010372.bin
5d0efcc52012d610a7e6600145b2ea18388aad0e6f67ae10ed56610479d69a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10208 bytes

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