Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbf0ac5269f85df…

MALICIOUS

PDF

65.1 KB Created: 2020-12-16 01:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031b0956001ba12d89dc8d08e88ef88d SHA-1: 6d2e7a71b4731d0a3b74f3b8ab89ee5edc7dc914 SHA-256: 4fbf0ac5269f85dfb0cad7c7b6771a2fb82d7caef02de6df479ad11b8914aff4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it's a lure for remote support tools, specifically mentioning TeamViewer. It also includes a large number of external links, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into executing malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://trafffi.ru/aws?utm_term=teamviewer+9.+0.+4
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f9d964e44001.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fb5274ab2584.pdf
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fabe282cac9d.pdf
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fc7a866be7c9.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5faee3012f1dd.pdf
    • https://cdn-cms.f-static.net/uploads/4414679/normal_5fa4d6bd73f81.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc10afc403f5353fd968892/t/5fc11d6f3f75b16643fbd04f/1606491503572/linux_clear_command_not_found.pdf
    • https://s3.amazonaws.com/toliwudalamem/tipos_de_administracion_publica_privada_y_mixta.pdf
    • https://static1.squarespace.com/static/5fc5c98f6b97992eb57d115f/t/5fd0043186dbd518ecc864e7/1607468082144/20077012568.pdf
    • https://static1.squarespace.com/static/5fce30d5169f3e188a7bcaef/t/5fd04a640c0c9b10ab03e0b1/1607486052700/gwent_the_witcher_card_game_extra_cards.pdf
    • https://static1.squarespace.com/static/5fcf081d9c5bbe6744623af1/t/5fd7078c72b1137fa98cbefe/1607927693700/18719339783.pdf
    • https://s3.amazonaws.com/vexeliku/eldorado_stone_prices.pdf
    • https://s3.amazonaws.com/bejenosugede/nadow.pdf
    • https://s3.amazonaws.com/vonusirukete/73198062012.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_off0000c262.bin
f342f87cb0fdffd4a57f9f07bf2ca12e7271058eaa6a2f8bb9fd1a832e9a0075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 5140 bytes
font_01_sfnt_off0000d3e4.bin
972203f0da75d515ceddabc1d17f643cb80e52b41b5c48b79e38a0b786540009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 10840 bytes

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