Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2666f0182e9f8c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-04 01:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6cf262a0a5b1a0a12ce6b7786c787f9d SHA-1: ac02b0d907ea7897a2f9e13ee54232a733b79c4f SHA-256: 8d2666f0182e9f8c3c2080bffcb22a2bf0cf55d465bb9263171b3b9372282c7b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://zajinet.ru/strik?utm_term=indefinite+integral+calculus+problems+with+solutions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505837/normal_5ff04ca5d3a8f.pdfIn PDF document text
    • http://puzuxozazepeme.22web.org/64129365315.pdfIn PDF document text
    • http://cyberlife.store/how_to_replace_cord_on_headphonesbq8un.pdfIn PDF document text
    • https://zazigiwozaka.weebly.com/uploads/1/3/2/6/132681333/daa7e2.pdfIn PDF document text
    • http://gidpopiteru.com/94799357845bbiex.pdfIn PDF document text
    • http://itayoga.space/the_dark_tower_wizard_and_glass_charactersfmzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_602d82960a680.pdfIn PDF document text
    • https://ralifanexipoker.weebly.com/uploads/1/3/1/3/131380500/329ed.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/rinurazuwizuvul.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/7802938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_601470c2361ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/19965226862.pdfIn PDF document text
    • http://gefofezas.rf.gd/3d_tuning_apk_hack_android.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/gps_module_arduino_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/ashley_book_of_knots_by_clifford_w._ashley.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/lg_9kg_top_loader_washing_machine_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/xomalenobelavusizalowoman.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/orasatha_album_video_song_in_isaimini.pdfIn PDF document text
    • http://poweradufuxi.epizy.com/how_to_repair_a_leaking_floor_jack.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/xevibinisisaxizutewat.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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 5736 bytes
SHA-256: 644afc7e3ccdd953cd8f4559fad3c6885aa90a70437caa44b2497dbd641ba630
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10460 bytes
SHA-256: 8220768b2705ca14438b4a5d26351cf6d8b0e4231a418341abb2309ece0d5ebd

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