Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc45f9af3da072d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-11 07:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 098477ed1667808e164e49d6d9c34126 SHA-1: 1d22784b9da8375599fe20784a15be19374cdc32 SHA-256: fdc45f9af3da072d4238ce95584440e513b7883c266d12737fd30d6062ab7706
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a mass of external links, with one pointing to 'trafffi.ru', suggesting a link farm or redirection to a malicious site. The document body, though heavily obfuscated, appears to contain keywords related to product listings, likely a lure to encourage clicks on the embedded malicious links.

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://trafffi.ru/123?keyword=air+fryer+copper+crisper+tray
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8d86e9b987f.pdf
    • https://cdn-cms.f-static.net/uploads/4408001/normal_5f927bc0ed2c8.pdf
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/loputi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/59b7041a-a251-4063-b574-752d117046e9/jafan.pdf
    • https://uploads.strikinglycdn.com/files/60948786-bde9-4b50-b591-fb7871999f0f/50971503224.pdf
    • https://s3.amazonaws.com/bovenotojitowe/juwogikufe.pdf
    • https://s3.amazonaws.com/remoxi/26409034517.pdf
    • https://s3.amazonaws.com/luresimosip/zagej.pdf
    • https://uploads.strikinglycdn.com/files/519e383e-7d02-4d49-937c-45fc4827116c/44747015990.pdf
    • https://uploads.strikinglycdn.com/files/a393e712-f790-499e-8454-fcbb3c2b4f3f/kekinawin.pdf
    • https://uploads.strikinglycdn.com/files/8a27e989-3db5-4cde-958b-6fafb2ab1f84/33241578586.pdf
    • https://uploads.strikinglycdn.com/files/ca21c62a-b0c4-47a8-a8f1-fcabd7f7d3e6/29752103921.pdf
    • https://s3.amazonaws.com/besafefaf/bench_press_workout.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_off0000cf95.bin
847ad65e9357335b8ade2557c9ba936248aa141cde50145db976278ebad6b334
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 4752 bytes
font_01_sfnt_off0000dfcb.bin
1ca93dcdf062522521f23798dad24381117f75c3efaab53f356637582693a47a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 10792 bytes
font_02_sfnt_off00010480.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 4324 bytes