Malicious PDF — malware analysis report

Static analysis result for SHA-256 921b1857a46ee26c…

MALICIOUS

PDF

68.2 KB Created: 2020-12-08 15:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9785d5a50fdc6bbd0f2a8bed9a1322f SHA-1: 1753f33593ceeb5636ca418855d7605d84972e10 SHA-256: 921b1857a46ee26c60a4f59c59515a026e28fa1c9e77e0917294bea979e9825e
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to drive traffic to external sites. The embedded URL 'https://trafffe.ru/123?utm_term=at-205+re-seal+instructions' is suspicious and likely leads to a phishing or malware distribution page. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 're-seal instructions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=at-205+re-seal+instructions PDF link annotation
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/594723929811a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/balboa_vs501z_troubleshooting.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe895e5c7695ca99606f9/t/5fceb88193aac70b807babc5/1607383169120/movie_maker_app_download_apkpure.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10f47bd14ff0dd29d9327/t/5fc75a5a7995075abde2b5d5/1606900322802/27741240950.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ca6ebdb33045eece7b0b/t/5fcd2696c836a917f9156958/1607280281110/pezukexugizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0804d74a-ead8-4a85-9a7b-ef48c8820c82/unblocked_games_raft_wars_2_hacked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79565504bb4653ce62487/t/5fc991a61a258d244fd70dd2/1607045545081/telecharger_solitaire_classic_klondike_expert.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b2965bcb0228a2ab1122/t/5fcc2dc6260a660a6bccaa81/1607216583850/the_sims_mobile_cheat_codes_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d438a6-40a3-4708-ba45-39ce6be6747b/yamhill_county_transit_routes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef48597-37aa-47e1-ac79-d28e1079d98f/optima_yellow_top_vs_red_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74fa0c3-bbc3-4031-b6c3-faa16e4c0e33/27566345767.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 5212 bytes
SHA-256: cf8e5a6bb62dc579f1023d737b989996f2ab485e2760223db0ca7cb9a7a0d676
font_01_sfnt_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 11144 bytes
SHA-256: 2bc38950c141ef944421fd3f7fabf4832cd16f492287e0ca889786418acde6f5

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