Malicious PDF — malware analysis report

Static analysis result for SHA-256 425f44602b8d3603…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 00:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9d8edae9a9475c7ed5b8261f4cf911f9 SHA-1: db996f4bde0b139402199c03286f480ba8d4067c SHA-256: 425f44602b8d360306bdb69ce5aa64cf09c095af69c42adb978dd8a5afc2ad0b
244 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 finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external sites via these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=zombieland+double+tap+full+movie+free+download+in+hindi+filmyzilla In PDF document text
    • http://help-mediasupport.com/happy_birthday_song_bgm_masstamilanpulbs.pdfIn PDF document text
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/lenodubosigud.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/rezamilafonuxa.pdfIn PDF document text
    • http://gapekiza.iblogger.org/ap_english_literature_and_composition_examination_section_1_multiple_choice_questions.pdfIn PDF document text
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/sewemakofagek.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/8a0fa2.pdfIn PDF document text
    • http://dommasters.site/puzesejilutejubqg589.pdfIn PDF document text
    • http://poopo.ru/87170991523a33ph.pdfIn PDF document text
    • https://zapadakutomar.weebly.com/uploads/1/3/2/6/132680787/nefimososepi-rakuja-pamawuselome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maligufaribez.epizy.com/firepower_2130_asa_datasheet.pdfIn PDF document text
    • http://kowetomad.epizy.com/kudemoralasimerinulawub.pdfIn PDF document text
    • http://pixagese.rf.gd/53165506092.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/complex_ptsd_from_surviving_to_thriving.pdfIn PDF document text
    • http://govuwetubor.epizy.com/6208473421.pdfIn PDF document text
    • http://xakitidopapav.epizy.com/dozofiduranurax.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5504 bytes
SHA-256: 21ee5ef16c0e4fdf8a66c1acc7b62072855cd3a0c18fb5494267be21f789c637
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10368 bytes
SHA-256: 8a7b7cf7ef46c56fa2856cc6ede94c218a9b5c57541f039af3e9f620c4eb3d14

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