Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bcc31fe61b9905…

MALICIOUS

PDF

73.9 KB Created: 2020-11-14 15:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 37e064470b156f0a72a24d6c06a7a86e SHA-1: d20ec00c6e09ee4353a7aa7c6a1907ad0bafff39 SHA-256: c9bcc31fe61b990501a1fef7b6c031c62b1772407766c400e93fea1560956dc1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to 'diagnostic types in social sciences'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=tipos+de+diagnostico+en+ciencias+soc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f9c5124d106f.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/6850229.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/nuteveg.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/0d1527f9-2087-4f43-afff-235e68851fec/bupofamezuvokozuxalokemo.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/maersk_aptitude_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c01494c-409d-4880-b094-9cd412150e73/lukiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/86501228575.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/jaxilepakimo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/1988_4runner_factory_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/words_that_start_with_hia.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/bangladesh_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/suncast_garden_tower_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 1864 bytes
SHA-256: 406a7ca4fecb2918e119da58a49813b8e681de62cb97c3d1397c1a4aa87fea68
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5064 bytes
SHA-256: 40108a2586139a24590b74a5c8c9e2004f8bd014674f0fd87d032e53fe074d34
font_02_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 12148 bytes
SHA-256: 445b03ac0a9d02b52348b96ede6a87ea17850ee97a5da4f5457038badb82e6e5

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