Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c4af55710cfdf…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 09:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40554975be85a2ca2ccb266e1359c3fc SHA-1: acfd6e9a6f520cce12a906130af602bcb574a20a SHA-256: f25c4af55710cfdfebdcd15d0856c60cb07e04fcd9fb4e55d7ee5bf81ef6d428
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic to various sites. Heuristics indicate these links are malicious redirectors and part of a link farm. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=mathematical+reasoning+for+elementary+teachers+7th+edition+pdf In PDF document text
    • https://cdn.sqhk.co/woxemumi/ibjhiiW/free_simple_guest_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/i8tijge/75516416083.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/snshhhb/zupejemade.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/gdIjgib/75236151027.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/59861955449.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/wufigivob_barabuvaxoliw.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/MjdSThj/30147933851.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/326300.pdfIn PDF document text
    • http://dafumod.22web.org/how_to_clean_hoover_dual_power_pro_carpet_washer.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/73737314591.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jhagg5E/69991261802.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/posufij/bonkheads_free_windows_7.pdfIn PDF document text
    • http://pomedoto.epizy.com/what_are_the_types_of_leads_in_news_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/tafakesugapirifazo.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/download_roms_gba_gameboy_advance_super_mario_land_2.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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 5756 bytes
SHA-256: c8128e9a38226af9d73bfee9821ddec439971b82b14e2c80d78747205cc1bc40
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10640 bytes
SHA-256: d1c716404ff69b298107ee0dca83fc7070f3a6829be0f199a7b7cfa229effcce

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