Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bce43179e79f868…

MALICIOUS

PDF

75.7 KB Created: 2021-04-06 06:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f7a823a5a94e951045dde3e0cf5b1a0 SHA-1: dd333e271e6c38623a8474a10956e61c59a9b080 SHA-256: 5bce43179e79f868d1fcb7ae1d51011b21e069da419cd583fd44d28454e1d193
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or for SEO manipulation. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the PDF is designed to redirect users to potentially harmful sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+use+a+sunbeam+ice+cream+maker
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/zasomirurafad.pdf
    • https://cdn.sqhk.co/zovitamojim/6xv5SXi/cell_phone_radar_detector_app.pdf
    • http://xugejujivekivu.iblogger.org/difference_between_bacterial_and_viral_tonsillitis.pdf
    • https://cdn.sqhk.co/pajokiman/ZLHcXjf/coffin_shaped_nails_medium.pdf
    • http://doxugivo.22web.org/kdigo_anemia_guidelines_2020.pdf
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/d1ea75e8ee6.pdf
    • http://kozupuj.iblogger.org/belajar_excel_lanjutan.pdf
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/pewokipelime.pdf
    • https://cdn.sqhk.co/xafukapewe/giaiqig/17911150163.pdf
    • http://xumegexujarev.22web.org/20993221064.pdf
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/7560720.pdf
    • https://cdn.sqhk.co/nulaliki/jd4mKj9/vex_45_degree_gusset.pdf
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/4ec988.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_6022132f1858d.pdf
    • https://cdn-cms.f-static.net/uploads/4402478/normal_6060173b66ca3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fobivojaburako.epizy.com/calculus_2_final_exam.pdf
    • https://s3.amazonaws.com/zafibimutadoti/rimosevoki.pdf
    • http://dunuruzofugavix.rf.gd/rubberized_asphalt_concrete.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/62256144741.pdf
    • https://s3.amazonaws.com/vuxagixil/the_loud_house_halloween_party_guide.pdf
    • http://texatopewewew.epizy.com/xesevumefetukelub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin
c0a6193f8d42a417bdcf63cf9b796a32cd6a53282ca5c1651521493a2f260c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5172 bytes
font_01_sfnt_off0000fd18.bin
261cf7b25035b5a99ff535fc7d3a1c67b9de869f3daeb56b5f5d2e03521ac81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10636 bytes

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