Malicious PDF — malware analysis report

Static analysis result for SHA-256 72852fb02d61dc0f…

MALICIOUS

PDF

91.9 KB Created: 2021-06-01 22:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6aae7abeb8e51ba250774733d9125b SHA-1: badb11cb13101f061229a9876ef00cba3c99775e SHA-256: 72852fb02d61dc0f9feba060128f1b6a5f947868d267367f817cbe9b30351dc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/pbw?utm_term=online+application+for+govt+college+of+engineering
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/goroxod_fudivasudema_vafukov.pdf
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/dajebovijex.pdf
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/3121198.pdf
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/norezepiwus_komemedesevu_tirukepob.pdf
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/mofok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5479a074-d1a1-4f1d-9e28-f0b74a042c03/how_to_set_up_a_sharp_aquos_tv_without_a_remote.pdf
    • http://jetipufagi.pbworks.com/w/file/fetch/144438120/download_cheat_zombie_gunship_survival_mod_apk_inewkhushi.pdf
    • https://uploads.strikinglycdn.com/files/7db481e5-3892-4a49-b858-0d9d291f4b97/what_does_the_myth_pandoras_box_explain.pdf
    • https://uploads.strikinglycdn.com/files/3fdd8787-17a8-403e-8f1a-2471572d76c2/the_boy_who_harnessed_the_wind_film_review.pdf
    • https://uploads.strikinglycdn.com/files/a1e3797f-495a-4fc6-bef8-84688a9fc3ec/fenof.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/144423567/59004548369.pdf
    • http://mapijakemifo.pbworks.com/f/luxuza.pdf
    • https://uploads.strikinglycdn.com/files/22abc217-af30-45b9-9032-3d586c12b6ec/why_does_rachel_not_wear_a_bra_in_friends.pdf
    • https://uploads.strikinglycdn.com/files/701781ce-f90b-46e1-ade2-d26a214b12b6/fugewalijigozowa.pdf
    • https://uploads.strikinglycdn.com/files/af1cf6c5-5003-4a94-bf00-894ef653124c/what_is_irishman.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144427755/converting_km_to_meter_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/68bc3d87-7580-4ecd-a226-019627cea918/how_to_use_a_bartender_kit.pdf
    • https://uploads.strikinglycdn.com/files/d62d75c5-1278-4647-ad2e-7c9c45eb1f3b/como_hacer_un_burro_con_una_caja_de_carton.pdf
    • https://uploads.strikinglycdn.com/files/8b2833b2-1cb9-4f96-b09b-11351edd404d/desejufixajanerivojotu.pdf
    • http://jetipufagi.pbworks.com/w/file/fetch/144441171/dasefejetalirusodu.pdf
    • https://uploads.strikinglycdn.com/files/8e865980-6cf0-44ea-89a5-e5f3b696fc7d/10262557264.pdf
    • http://wufamazajo.pbworks.com/w/file/fetch/144445824/nazaxurixamud.pdf
    • https://uploads.strikinglycdn.com/files/f4d7d386-ba1e-46b1-87cb-c825ef80b0e7/coleman_lantern_6_volt_battery_pack.pdf
    • https://uploads.strikinglycdn.com/files/3ada9c3a-6e79-4dc3-bf42-9662282e669f/dell_latitude_e6540_drivers_windows_7_download.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_off00012a6d.bin
1f69cd0f0fce492aa5f1bdabadb9c8024127cf646658adef937978802ed5582f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 5092 bytes
font_01_sfnt_off00013bdc.bin
708989b8441a7c44e6ca99df6a7f7c4949a95eefc28cbe7f9b85fbc342f513fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 11040 bytes

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