Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7b14c3677aed0d…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 02:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 38549feb3e29bb6db03a028e3cab3e1d SHA-1: efd582c2dcf04d9073114eae8874faddc6ae9194 SHA-256: cf7b14c3677aed0d57b58cf975f3f88f3fd339c5346f033b635f523c24a13b39
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs points to 'trafffe.ru', suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=juegos+tradicionales+mexicanos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5f909ac1a705d.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/gejakejoguxos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2f0b0f-f086-4aa7-a218-5ddc0674ce29/xenenapezafamok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7355b8d8-69c5-4af2-80db-b9c2c18f038e/trastorno_de_movimientos_estereotipados.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/modern_world_history_textbook_chapter_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d02cef6-37c2-497d-ace6-5c3783bd11be/saxonovuzejum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a10033a-6f7b-4fe8-921e-39b226823b2c/the_rose_that_grew_from_concrete_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/ap_module_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c58e1db-753e-40f3-bef6-c3b1c3630abc/devejobigupegagedobexajej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5c7358-b0fa-4048-bd58-8c40979f4704/investigacion_mixta_segun_sampieri_hernandez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 5316 bytes
SHA-256: 0ae30e575ba852cdf13195344fa175a7ab1c791db9b45e32802241ed58e7265c
font_01_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 11456 bytes
SHA-256: ae2d41920aeda6f7505ca425e58b030fcc0b830d85815361ab06c2471ae27817

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