Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e8f4029102abee…

MALICIOUS

PDF

82.8 KB Created: 2021-01-01 11:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3da7772299c6f8dbe40e58e296b556a SHA-1: 76f670f1a8cc9f72c8e494a68658e55b18d61544 SHA-256: c7e8f4029102abeef511d2eedc41906c6c8dcef1e2d7678ef23d4d16c706b900
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://trafffe.ru/strik?utm_term=todo+cuero+lomas+de+zamora', is directly associated with the malicious classification. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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-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://trafffe.ru/strik?utm_term=todo+cuero+lomas+de+zamora
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fdace81ecd8b.pdf
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/5470998.pdf
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fcae27d130b9.pdf
    • https://kuruxodevudule.weebly.com/uploads/1/3/4/7/134728431/jexege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/33a08a0e-6235-44b9-9a48-341586a4ae52/bosch_exxcel_fridge_freezer_instructions.pdf
    • https://uploads.strikinglycdn.com/files/c512705f-da5b-4856-a1e6-95115d539405/63592664371.pdf
    • https://s3.amazonaws.com/saziwijaxodav/sekopukonawoferu.pdf
    • https://s3.amazonaws.com/zabejuvijolu/should_or_ought_to_exercises.pdf
    • https://uploads.strikinglycdn.com/files/2403f2c7-a0a5-4789-a956-7ca2f2156ed6/dopononalaripu.pdf
    • https://s3.amazonaws.com/mejigavukolu/modifevavexoxavib.pdf
    • https://uploads.strikinglycdn.com/files/de2377ba-918a-4cb2-9c42-4b3ec0014c83/dujopijujo.pdf
    • https://uploads.strikinglycdn.com/files/1c4ae388-6bc0-47c7-a1dd-8b036763d2fd/pizuwegexukokevurex.pdf
    • https://s3.amazonaws.com/rotowan/hunger_games_book_two.pdf
    • https://s3.amazonaws.com/limewub/70602465513.pdf
    • https://uploads.strikinglycdn.com/files/1d1093b8-e672-4c3b-b912-c197466c9f70/43247599776.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df76.bin
72f49d62d9b60f8e20b812159a530cb6ec61e09d928a0591c7b0eb3c10091889		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5084 bytes
font_01_sfnt_off0000f0a2.bin
07fe37401791749e1ddf265c646ef9c9aeb03953d93d54458817bd003666f9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 9036 bytes
font_02_sfnt_off00010dd8.bin
97f4af1dd132eee043f1111354bd5bf0e3fc33ba30e5a0de14f1ef0df8a6e68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 12056 bytes
font_03_sfnt_off00013506.bin
5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 1736 bytes

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