Malicious PDF — malware analysis report

Static analysis result for SHA-256 c598849a8d106be0…

MALICIOUS

PDF

69.2 KB Created: 2020-11-17 06:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45bd1950281784f6fb3b7836ef4c1fbe SHA-1: 437cc58ad0c0b3a2ba618ba10fdf123e4008476d SHA-256: c598849a8d106be07357bff5a064adaf7d7b445bfcab387e35f02538f1b0dd22
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of embedded URLs and the PDF structure indicate an attempt to direct the user to external content, likely for malicious purposes such as phishing or malware delivery.

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/123?utm_term=black+butler+season+1+episode+17
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fa2a6bbea6a3.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f89898520a78.pdf
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5f9a56ee1bfa7.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f8bc81634da8.pdf
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5fae2df01e45d.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5fa0319f7b04e.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fa8a2dd71e2a.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8b56a58b9dc.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8fe29d76327.pdf
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fa7eca722850.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5f945353beb95.pdf
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5faa0e9aec652.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/texifaxepag/tubugalopemefokura.pdf
    • https://uploads.strikinglycdn.com/files/6d314f66-ab9a-48ef-b415-b58c201f1c1f/limbo_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/1a6645c3-0966-4df4-b040-87835d533795/d_and_d_5e_monster_manual.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_off0000d17a.bin
027dd58b3321977a65d3920b735bf3132c6194d4707b40f634699ce85fe37964
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5452 bytes
font_01_sfnt_off0000e415.bin
c12603d1598d96f5b2f714b8f9f7b64bab6ef5878d6178dd3a420e5e8d9ae443
pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10496 bytes