Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c61fc775ed4d58…

MALICIOUS

PDF

63.3 KB Created: 2020-12-26 23:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa1e284994389f15a14a0a7c96c2d12 SHA-1: 1d268707d5d08a22c2991769bbd8c369c08781f9 SHA-256: 24c61fc775ed4d5887f6994204a8d4e204b8cc730178b351b4ffeac75609e53f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to 'traffine.ru', suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

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://traffine.ru/aws?utm_term=bhai+ka+birthday+song++marathi
    • https://static.s123-cdn-static.com/uploads/4410695/normal_5fc7c27aede0a.pdf
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fb2944acfb83.pdf
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f9fd63d1b70a.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/vabesagizewi-givewu-seguseresadafom-rojedesasuketup.pdf
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fad4ea6304b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suzeduselu/webobafezuruvabesedir.pdf
    • https://uploads.strikinglycdn.com/files/ae1e8637-6451-4db4-82d8-2246337d33bf/76085213352.pdf
    • https://s3.amazonaws.com/sirilagewuga/vudizaselobixebojefi.pdf
    • https://uploads.strikinglycdn.com/files/855c4de5-4489-49ad-8b95-10765b4aed54/70729971126.pdf
    • https://uploads.strikinglycdn.com/files/3cd7c91c-45f2-470a-9b64-140c344a5a86/how_to_knit_fingerless_gloves_on_a_r.pdf
    • https://uploads.strikinglycdn.com/files/4e7bc537-0cfc-4584-a7aa-babd5a0a78a4/the_doctrine_of_dual_federalism_held_that.pdf
    • https://uploads.strikinglycdn.com/files/52717077-a2a2-449c-9fae-24d0d93b580b/fafinemunekizixutupevef.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_off0000bd15.bin
5f88ed07ae9a5ef4870eba2d1d39480abf98079c609aa2aa8dc9191306237bad
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 5564 bytes
font_01_sfnt_off0000cfda.bin
2729afdaf38b1c16ba197027db21d35e9093f1cbef68767bb2e9f4712892624b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 9592 bytes