Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc18680860d2e09…

MALICIOUS

PDF

83.1 KB Created: 2020-11-17 22:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82d5dfb5e4b0bb7a871c23643f0486e SHA-1: 5876b25c1c6d30c023d5ae18bcf18970d24be871 SHA-256: 1bc18680860d2e094e1f7fa766f1f3796845bad143689d465e84d2abb18efdc8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one prominent URL pointing to 'traffine.ru'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=alpine+cde-123+bluetooth+pairing
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f87bde65c469.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fa20ef1c86dc.pdf
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8e8238bbc2a.pdf
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f9f83aae6155.pdf
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/jabitexotonizowefis.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fb2ae76d7e19.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f8ae9b43f324.pdf
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f957d9ed3394.pdf
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f95287d2babc.pdf
    • https://defoxili.weebly.com/uploads/1/3/4/5/134527702/nijefimekenoxadejus.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6807460d-d255-4c25-9e70-0fbbf29b6c1e/bogixoreviwavazuxojebusa.pdf
    • https://uploads.strikinglycdn.com/files/421dbb45-f499-429f-ac4e-1492d83762ae/90077649552.pdf
    • https://uploads.strikinglycdn.com/files/56ed64d3-1ee3-46a6-9556-71c8942464ec/collective_nouns_worksheet_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f94b.bin
db6bd9f6336c56dd168df6bf9f654184bfec3194eb35202e9a06231986abfcd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 2360 bytes
font_01_sfnt_off00010361.bin
019c5c2c0b1e93c829a6fdea437effc9f3687cf2221ba8b25f1a12603a7bf7c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 5664 bytes
font_02_sfnt_off000116a7.bin
ac47e52602f128f69258280c7d1cee0ceda2673dc05c491ae46721ced8f91c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 11508 bytes