Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74acf4a53d5d9e0…

MALICIOUS

PDF

77.7 KB Created: 2021-04-04 04:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd7652310f23437728cadab7496748ab SHA-1: dd7735e87dbcfc353f31d295bebc2e808af961c8 SHA-256: e74acf4a53d5d9e0255bbd84fa11c9b5f0083fbe73e528a4a1489a804f8f787f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=aiche+2020+abstract
    • http://whalesqpa.fun/41882014913kcqkz.pdf
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/potabalafes.pdf
    • https://jaluxuza.weebly.com/uploads/1/3/4/3/134345387/3496839.pdf
    • http://buytoday.cc/57344393903rol9m.pdf
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/4911d.pdf
    • http://gladkoe-telo.xyz/93696634087q3y6v.pdf
    • https://kuwewukes.weebly.com/uploads/1/3/1/6/131636575/ganonorilonukim.pdf
    • http://indohealth365.online/how_many_chapters_are_in_the_fault_in_our_stars_book97079.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genedesowul/zatiximewikusik.pdf
    • https://s3.amazonaws.com/rujabepifar/toro_wheel_horse_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/52efbbfa-902d-4afd-879b-332552ee065d/how_to_teach_an_older_person_english.pdf
    • https://uploads.strikinglycdn.com/files/122bb1da-2880-450f-aca9-d1c5650cac34/nenomegevem.pdf
    • https://s3.amazonaws.com/zisulamisozoto/multicultural_social_work_practice_2nd_edition.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/storyboard_animator_app_review.pdf
    • https://s3.amazonaws.com/xozeb/best_book_for_probability_and_statistics_quora.pdf
    • https://uploads.strikinglycdn.com/files/d2bc6f68-38fe-4236-9708-aaf9051ea651/is_the_nikon_d500_worth_the_money.pdf
    • https://s3.amazonaws.com/nemafu/creating_word_templates_online.pdf
    • https://s3.amazonaws.com/bezegoluzose/ambarsariya_movie_480p.pdf
    • https://uploads.strikinglycdn.com/files/7689ad69-bf24-4bb7-ae8d-e6fee3d5b775/47559849356.pdf
    • https://s3.amazonaws.com/wefemabeni/dough_sheeter_for_sale_florida.pdf
    • https://s3.amazonaws.com/buxoparadazegu/kixakefunegu.pdf
    • https://s3.amazonaws.com/bufipevuril/zotepajebupegonugeli.pdf
    • 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_off0000f2b0.bin
a219bd937859a6a101bce33f5125abc6e8b3a17b0b96c257117a9bd97d20405a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5260 bytes
font_01_sfnt_off00010487.bin
66be7d414d8f9225abcd0769d819d9b235088738a5f81aa1df78f30eb79787e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10960 bytes

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