Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40aa806b5e3007…

MALICIOUS

PDF

77.8 KB Created: 2021-06-08 06:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67fa6cec58507f4a44828a5b3e883463 SHA-1: c8412fd3c42ec3e1a711e963dd4e2fc36835f870 SHA-256: 4c40aa806b5e3007f5f3762143f3c8adb2c4ca1f213a62ed0a1660b0e4e38598
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily truncated and obfuscated, contains text related to 'hacking prodigy level', which serves as a lure to direct users to malicious external sites.

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://smidgel.ru/pbw?utm_term=how+to+hack+prodigy+level
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/vefud-gugigodadote-polojijirepeb-sinese.pdf
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5fdf022b53f17.pdf
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/8711133.pdf
    • https://static.s123-cdn-static-d.com/uploads/4374376/normal_60b247648d2a8.pdf
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fe19731176d3.pdf
    • https://cdn-cms.f-static.net/uploads/4505837/normal_5fdc6dafc23c4.pdf
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/gojapanalulevalij.pdf
    • https://cdn-cms.f-static.net/uploads/4496582/normal_6045c2e71acb0.pdf
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fce408a48155.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/2158881.pdf
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/kekekodejinegel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zilujilixeti.pbworks.com/f/32051913501.pdf
    • http://gulisapil.pbworks.com/w/file/fetch/144730746/6687492518.pdf
    • http://ziduzobif.pbworks.com/w/file/fetch/144619104/pokemon_white_2_rom_hack.pdf
    • http://nadisizaze.pbworks.com/w/file/fetch/144667647/2356568191.pdf
    • http://kedefoviraj.pbworks.com/f/how_to_get_call_details_of_any_mobile_number_without_otp.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_off0000efd0.bin
1df8577484e73baabced5083d2399a9b15d6df81952df80549e19bfe187ea26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 5436 bytes
font_01_sfnt_off00010266.bin
f9f1c01891fb0f56616dbfe2ca6b1bb6d56f2e1ab3c9df28eb450b33b5f4cc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 11624 bytes

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