Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbbeb987120c143…

MALICIOUS

PDF

70.8 KB Created: 2020-12-19 00:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb98957133c2f82f8a6436f1f053142b SHA-1: 5ca70a2d2bd83f779c66b019158f2f5de265e84e SHA-256: 7fbbeb987120c1435596785de8885cc9a2d18750e36b37c8302d4516d9c77620
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The primary malicious URL identified is trafffe.ru, which is likely used to host or redirect to a phishing or malware distribution site. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=arijit+singh+love+songs++2019
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fcd9ad61a178.pdf
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5f9cea553b234.pdf
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/rotav-zolalomawaku-juzilanimaso-garovofej.pdf
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/f34e8532d.pdf
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/188e41.pdf
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/3335983.pdf
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/e43568.pdf
    • https://visajemilami.weebly.com/uploads/1/3/4/2/134265887/ef720942cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genukopapovixo/cookie_jar_gym_class_heroes.pdf
    • https://s3.amazonaws.com/vikukinumet/sizapi.pdf
    • https://s3.amazonaws.com/kasuwevovog/72366061388.pdf
    • https://s3.amazonaws.com/lijopavexanuse/nitini.pdf
    • https://s3.amazonaws.com/fosagoba/java_all_football_games.pdf
    • https://s3.amazonaws.com/biwubeleba/alkaline_herbal_medicine_download.pdf
    • https://static1.squarespace.com/static/5fc59b8916f6d44b07de8fd3/t/5fcd233b5d2e6f3bda44ec59/1607279420345/hot_wheels_id_smart_track_kit_black_friday.pdf
    • https://static1.squarespace.com/static/5fcea0e06ef5f3125355f619/t/5fd149cca34a607c16b5b44c/1607551437823/51830946422.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_off0000d78a.bin
55d5f97432a42e100467d7a77edb4ce854b68d9ad0ed8af7747268bd1d3df64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 5344 bytes
font_01_sfnt_off0000e9cb.bin
960c7e095a9e2dabe5df891fca79783a0a62defd4171685d36689bdd3bf397d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 11108 bytes

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