Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c1fd73dcd47794…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 08:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2bed195a76764f84e07a085337e1f313 SHA-1: 0fb4d9394ed6067e8ec3efc64b59e85addb72ca7 SHA-256: 24c1fd73dcd47794274401d5f4a3ef10ed3e95ec9373b839468cd8bf9e95758b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm designed for disposable hosting, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to reference product names, likely as a lure to encourage user interaction with the embedded links.

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 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.
  • 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://bologen.ru/strik?utm_term=ninja+foodi+pressure+cooker+%2526+air+fryer+-+6.5qt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504788/normal_602140e117880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_60061121a4109.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ihghRha/5251778112.pdfIn PDF document text
    • http://weraka.online/2002_ford_explorer_xlt_fuse_box_diagram7a80a.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/Kgdvjd6/kogujepokixijonifovovegul.pdfIn PDF document text
    • http://zavodtriumf.com/south_west_gauteng_college_application_form_2020hq45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6010d42636de6.pdfIn PDF document text
    • http://s-tochka.ru/elementor_template_types287kv.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/hcjaWnI/dragon_ball_wallpaper_4k_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/GWXgjjb/animal_restaurant_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_60300d3a93558.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/dCjbHJ8/talking_kitty_dunjay.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ijgcKja/58735366426.pdfIn PDF document text
    • http://deine-gabe.com/97683865557dm7bn.pdfIn PDF document text
    • http://nubolats.xyz/fovasajepizasegixef9lkss.pdfIn PDF document text
    • http://netewe9.xyz/867328748tj2ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisezemewarajox.rf.gd/80798531615.pdfIn PDF document text
    • http://favekagopu.epizy.com/xemodiduvuzisanaf.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 5224 bytes
SHA-256: 0e0b0d932d60720164eebe045d38e0a86b09374b3ca79bbd5db3d27fb956048c
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 11384 bytes
SHA-256: c0cda690040e79e789d1719a6d952ad49989597870b97795a0236a2148ba5bd5

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