Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2308fbe1d799cb…

MALICIOUS

PDF

87.6 KB Created: 2021-03-16 02:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 823d5c05119bfc0de82560096df4cc05 SHA-1: e082e409dc62940d114185caf8233ddd1a13f593 SHA-256: 9b2308fbe1d799cba03b5d69e94cef71f1af4ca96ef8183e34560c76ece42dd9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites, likely for phishing or malware distribution.

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://botokaw.ru/123?utm_term=good+free+budget+apps+android
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/jipunovovi.pdf
    • https://cdn.sqhk.co/jipodipotaj/gcMjjie/lidexeziruwabuzibititujo.pdf
    • https://vutujevofi.weebly.com/uploads/1/3/5/9/135971838/kidunodok.pdf
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/6d7369e0a007.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/pumaxifedemuse.pdf
    • https://gufobigan.weebly.com/uploads/1/3/4/4/134481927/3573440.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/fubofufefipujit.pdf
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/lubiredixawu.pdf
    • https://cdn.sqhk.co/bokirebi/diitdjd/25947495573.pdf
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/9f68b2846ebf94a.pdf
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/ed6e7d6732146.pdf
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/guvapuf_masazul.pdf
    • https://cdn.sqhk.co/busoleva/ig25Ggf/dune_trailer_tenet_australia.pdf
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/potefiganasubadim.pdf
    • https://nuguridafames.weebly.com/uploads/1/3/4/6/134650763/4074338.pdf
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/9463353.pdf
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/3806194.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuwuzerijofa/6th_grade_science_weather_and_climate_worksheets.pdf
    • https://s3.amazonaws.com/jawusawar/vosemiboxuru.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/que_significa_liderazgo_liberal.pdf
    • https://s3.amazonaws.com/ninasivol/how_to_service_a_tohatsu_outboard_motor.pdf
    • https://s3.amazonaws.com/kulinisokakewi/59680198582.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_off000119b0.bin
4f021121ef8c2adeda44f7495a724deac0e81487b215b269c0428352f23299f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 5348 bytes
font_01_sfnt_off00012bf1.bin
bbefab8c8e90a582c8eb4b416ed1dd0d9b701c177f3015d37f6bd6cb1e532ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 10972 bytes

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