Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d2ad4e70d5ba4c…

MALICIOUS

PDF

79.5 KB Created: 2021-06-13 16:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e1c3ce3d105db93867f5db8ef6e05a SHA-1: d78e2be26db8da87af63b754ce174b0bcd2db385 SHA-256: 33d2ad4e70d5ba4c38642cf2c5bfd8d27ad91626689e6658f6e81c888b96d1cf
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 are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/pbw?utm_term=betrayal+at+baldur%2527s+gate+traitor%2527s+tome+pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_606d8ca75166a.pdf
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/6659170.pdf
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/pozot.pdf
    • https://sadusobagobazep.weebly.com/uploads/1/3/0/7/130776682/8422981.pdf
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/xazowawos.pdf
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5ffb377d5349f.pdf
    • https://cdn-cms.f-static.net/uploads/4487663/normal_5fd83bc9bbf33.pdf
    • https://static.s123-cdn-static-d.com/uploads/4482619/normal_60b32f7a4d804.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_601966e0b5c86.pdf
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/d02be34.pdf
    • https://cdn-cms.f-static.net/uploads/4453764/normal_606dd43779de5.pdf
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/cff06b.pdf
    • https://cdn-cms.f-static.net/uploads/4420230/normal_6053096810b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4393186/normal_603903d9c97de.pdf
    • https://cdn-cms.f-static.net/uploads/4461229/normal_604d251d6bffd.pdf
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fcf6abe38fa8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83a4f09f-f102-4678-b0e5-77ec332120b6/gekakefaranegapedojijepun.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144555684/97584798809.pdf
    • https://uploads.strikinglycdn.com/files/229302ad-7642-43bc-99ff-b46c2d2600ea/rilesewejomupe.pdf
    • https://uploads.strikinglycdn.com/files/455ab763-4322-400a-a0aa-3154fde777f9/17746742647.pdf
    • http://pezeliv.pbworks.com/f/how_to_use_a_prepaid_electricity_meter.pdf
    • https://uploads.strikinglycdn.com/files/61e739c4-c17f-4521-84f5-18275e894bc8/how_to_replace_light_bulb_in_kitchenaid_refrigerator.pdf
    • http://sisagexal.pbworks.com/f/60290193672.pdf
    • http://wodupabizel.pbworks.com/f/xaratuxeze.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_off0000f990.bin
8a60eb42f51fddaf0d1a1171f3271577326d290601096b31bb1a8d309e081ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 5688 bytes
font_01_sfnt_off00010ce1.bin
c7dac047dacf097fedcdd16533a97decc6b16a04d2f9de9397be9276e950bb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 10272 bytes

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