Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5544e55d56e1cc7…

MALICIOUS

PDF

75.0 KB Created: 2020-11-18 01:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f55cf3ba5b27ba602af3371709d3603 SHA-1: 5d18983f14e6476c168998492e19f7c06cc480b6 SHA-256: c5544e55d56e1cc78dd4781a048779347bc451f6dd08fa732b495b87e5b219c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://traffking.ru/strik?utm_term=traffic+engineering+and+transport+pl', suggests a lure related to traffic engineering. The presence of many external PDF links, including one to 'datirelegewewat.weebly.com', indicates a potential distribution or phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffking.ru/strik?utm_term=traffic+engineering+and+transport+pl
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/zonujagofunalu.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/vibegigiwanubep-wekimumage-xikunozisisano.pdf
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/sifirozubekomobaroba.pdf
    • https://cdn-cms.f-static.net/uploads/4486374/normal_5fb28a2fb547c.pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fa0b5e68ab49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ba103db-35d1-4cfc-b4d8-336915453363/15323524388.pdf
    • https://uploads.strikinglycdn.com/files/59a05d48-573f-4390-8588-85264012a174/bozekujaromekabejizomamo.pdf
    • https://uploads.strikinglycdn.com/files/2f231bc7-ceb6-472c-8430-1e6b1d97b86f/4889260340.pdf
    • https://uploads.strikinglycdn.com/files/8b294007-42c9-4d2f-b8ee-508a509eb008/zipitatatas.pdf
    • https://uploads.strikinglycdn.com/files/e1cf09a0-f64f-4179-adaf-0c062069744d/clone_hero_setlist_google_drive.pdf
    • https://uploads.strikinglycdn.com/files/546f71b0-609f-44dd-b0bb-ab359d44cbff/60982225268.pdf
    • https://uploads.strikinglycdn.com/files/e8341cbe-c293-4cd6-98a1-4e4880a752f5/sabivinunudorijuxoj.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_off0000e705.bin
0fc977b8a34eacac74222462322694148a1f8c16b206e136e55103bad765192a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5272 bytes
font_01_sfnt_off0000f903.bin
945047069731d0f7e1c1d71e2bb8bb5a65794d53d0980ef3273cdd725297568f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 11460 bytes