Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c31fb252824985…

MALICIOUS

PDF

89.3 KB Created: 2021-04-16 15:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8a22e0628aae13536bd440a52ea9a4dc SHA-1: 251836b2e1ab6cd1e8c9033e5763c67c4e128b19 SHA-256: 89c31fb25282498574191f28f1950a96a4e2c98db8426afe31b07463b6823f37
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+disassemble+sodastream+source PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6018f1997bdb5.pdfIn PDF document text
    • http://garantiya62.ru/8598371256840lt0.pdfIn PDF document text
    • http://naturagrush.space/popexupanetupugasagyvcdo.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/iihmhe7/54488023858.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hfig4gi/zixubajeri.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/puvokibuko.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/lutodajukufaraw.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/ijchahi/cable_size_calculator_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/1xiaBNs/kinobomux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fc96f46c04b1.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/pelixevadar.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/ibbzsge/parenting_guidelines_south_dakota.pdfIn PDF document text
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/c156dd254ff39.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/af9aafc9da0e86.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/kufik.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/MSjcKhd/jotaro_s_theme_piano_sheet_music.pdfIn PDF document text
    • http://tugrull.com/bujikakoznti5l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 5276 bytes
SHA-256: d4031d466a3f76634d093b057ac5a957e8c4165667787c950baa5dbcc3cde0a6
font_01_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 11628 bytes
SHA-256: b6b7ac3c05b9a9fc62037e7ab02d63d02a66b5573c87fc4a44c8554fdc93c890

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