Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36ed96f48dd8649…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 13:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23ed3daceb0e8e729520630ef2b6045 SHA-1: 5db1b073ee2acf246ec7fbbe32c5abc0cc89f229 SHA-256: b36ed96f48dd86495809a31130d957b82a8c9f5be1fa391eb6343062124b2315
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 of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bologen.ru/award?keyword=ancient+greece+civilization+pdf
    • https://cdn.sqhk.co/gitovera/iCRkiet/nepuroregipexi.pdf
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/3620460.pdf
    • https://cdn.sqhk.co/modesarox/TzjfMjb/sdf_3d_pro_apk.pdf
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/0b7068b7c6.pdf
    • https://cdn.sqhk.co/jogibigeda/jPxRMGL/petijapowimexaziguguzil.pdf
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/391a2779ed.pdf
    • https://baluwona.weebly.com/uploads/1/3/4/6/134611665/bukifededavidabigiwi.pdf
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/6894381.pdf
    • http://nekretnine.site/46055235555aypl1.pdf
    • https://cdn.sqhk.co/kupejabel/agiiahc/74838993822.pdf
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/zaxinabutiv.pdf
    • http://muzhskoizhurnal.ru/juvudufafevupugamanobanbrv5.pdf
    • http://50offshop.pro/zirowe84kkh.pdf
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/nimibi.pdf
    • http://sayseedokg.com/73629376667h2ydo.pdf
    • http://dnepr24.info/65269667653jr848.pdf
    • https://cdn.sqhk.co/fuwifemi/2jaUBP9/morexujusewuseg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a0aae4df-528c-409a-9289-7ccb30f14f54.filesusr.com/ugd/c345b0_abd8170ea62b4717a8361eaab79af248.pdf?index=true
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_75745a3c61d64b399c2ea41a75a90c7a.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_3f09d1e9e75644e78f421d317dd1e895.pdf?index=true
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_1509872838d14b6cab5e5ca7e95001d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae2024ce-c86f-4322-b687-a551dd650ce5/the_handbook_of_rife_frequency_healing_by_nina_silver.pdf
    • https://uploads.strikinglycdn.com/files/916bb13e-7681-4682-bf18-f5a3a90c222c/nokewajawus.pdf
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_f7a265ef6ddc45c983e36978138ed710.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f69a4a7c-b42f-49df-aa6b-1b4dd685cfcb/20_mililitros_a_cuantos_gramos_equivale.pdf
    • https://uploads.strikinglycdn.com/files/3d8d01c5-f00e-4990-ac6d-353311ed0923/which_app_is_best_for_reading_novels_for_free.pdf
    • https://uploads.strikinglycdn.com/files/4c91010f-b4c1-44c3-abe9-ddca2fcd0cfb/how_to_sing_christmas_carols.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_off0000f45c.bin
a341f879fafa140b41fdcf3a8c655d9bccf51cd5e6f1200cb8d95991f26e6804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 5244 bytes
font_01_sfnt_off00010656.bin
d5014e1b940da0fa1d095c5543778e04fc1987a54190bb94edfbe3591b64d3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 10352 bytes

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