Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf18be9d7f754e1…

MALICIOUS

PDF

71.6 KB Created: 2020-11-18 18:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82bea9e5339f25ed75a4a450174aeaa2 SHA-1: bd3977fb26325fec5b4c9c3b1739bf38760be515 SHA-256: dbf18be9d7f754e1b8c6f74489d47a51a8e2fc938e46cb596cb0d49a74a1cae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, indicative of a link farm designed to distribute content or redirect users. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting an attempt to lure users with the promise of free downloads. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=emt+books+free+download PDF link annotation
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/6800037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f8749f37e67d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5f9d89412abc5.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/givuxodefomuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tumasun/bzu_prospectus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/50483693920.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/69303502129.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/back_to_eden_health_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/57079498084.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/satyanarayana_biochemistry_latest_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/eldritch_knight_guide_nwn2.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/janeguwined.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/bally_total_fitness_gym_membership_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/journal_el_watan_archive.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/atlantis_antediluvian_world.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/10405407061.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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 5044 bytes
SHA-256: 8d0ec389a9513e471ea6f4247345ef63f2f4d4be0749400ab1c83b789214cf9b
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 11316 bytes
SHA-256: 49f12c800306a6c7660ca5f4df8bbb63689b5af60ee27d0d3740c4b3481272a0
font_02_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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