Malicious PDF — malware analysis report

Static analysis result for SHA-256 c325401363ba4cd9…

MALICIOUS

PDF

92.1 KB Created: 2021-04-05 15:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef92457aae0e2d3aec12ff7f9aa67388 SHA-1: 7c36e4f02c0b97cc053e4296b48f2a4b620678b8 SHA-256: c325401363ba4cd950474d7b2a3f2c95ddb5746fb8654f32ebf0c5b239dd8fa3
156 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 PDF files, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=rental+agreement+letter+template
    • https://cdn.sqhk.co/diwiporeb/JiahdXC/carvel_ice_cream_cakes_near_me.pdf
    • https://cdn.sqhk.co/moturalogupe/gJKyKQG/twist_stack_snacker_rainbows.pdf
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/1434986.pdf
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/diwavimeme-gejogakebawone-nudatanevekoni.pdf
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/zojuvajuvufa-nujomoxizeje-kuvugonobidu.pdf
    • https://cdn.sqhk.co/lugenaru/Kiatgg7/lafubemeniwafosadiwigasid.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5fe8d4e0d6d1c.pdf
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/3845988.pdf
    • https://cdn.sqhk.co/rinugezig/dhdgfy8/new_gangster_crime_game_apk.pdf
    • https://cdn.sqhk.co/porosobof/niB1hhE/death_moto_bike_race_motorcycle_racing_games.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fc8939a97174.pdf
    • https://cdn.sqhk.co/nunexijezep/aAmjibH/yasuo_guide_for_beginners.pdf
    • https://cdn-cms.f-static.net/uploads/4449421/normal_600e8be5425bb.pdf
    • https://cdn.sqhk.co/divekezor/ejidhiZ/robots_des_moines_iowa.pdf
    • https://cdn.sqhk.co/woteruzid/NFhiihi/kawawipoziwimuwamitasak.pdf
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/98884dd3617a60.pdf
    • https://cdn.sqhk.co/nupasoxure/gfyTRs7/wyvern_dark_souls_3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gateme/nipefugejokulezinejogiro.pdf
    • https://s3.amazonaws.com/pisedij/14541526001.pdf
    • https://uploads.strikinglycdn.com/files/312182e0-b469-42be-ad62-751c13bc6f15/68080466072.pdf
    • https://uploads.strikinglycdn.com/files/b6f1dd5b-61b4-4ad8-9e14-dc4264714db8/wufevosavefulezimafisunov.pdf
    • https://uploads.strikinglycdn.com/files/bf9bd671-b62f-4326-963a-5a06c736fc52/excel_spreadsheet_templates_free.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_off000128ef.bin
c4c3a396bca301712e45ac655749ed164df0ece7a834af80a13439bdf317fbf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 4968 bytes
font_01_sfnt_off000139c7.bin
1f53e71bc3d14cd9ad1e9d5a223141d6b990b111effccc62edf24267618732fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 11700 bytes

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