Malicious PDF — malware analysis report

Static analysis result for SHA-256 036b85a0f4ff80eb…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 00:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93521ea257bc067a91c9b1f2b8bac51b SHA-1: d6936c937a824ec237cdc8acd8da4bfb00395f44 SHA-256: 036b85a0f4ff80ebf710bdf07eca07b8541125887649e835b9f8cc349b495d5f
156 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, likely intended to redirect the user to a malicious site. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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-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://trafffe.ru/123?utm_term=7+deadly+sins+catholic+symbols
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/kuzusajerakoz-lokomiji.pdf
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/b089515.pdf
    • https://xuxavapivobe.weebly.com/uploads/1/3/4/5/134590147/dolasuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitizobuv/35075983956.pdf
    • https://s3.amazonaws.com/vetamedisoz/opposite_of_always.pdf
    • https://s3.amazonaws.com/lotibabakuj/1191557718.pdf
    • https://static1.squarespace.com/static/5fc15bd3ff13940aa242d827/t/5fccb9042fa8bc6bcde5e074/1607252229961/71025626985.pdf
    • https://s3.amazonaws.com/banula/blanca_nieves_y_compania_english.pdf
    • https://uploads.strikinglycdn.com/files/0f4cc02c-3770-40fe-8fd2-f7a211e2661d/temobapuzid.pdf
    • https://uploads.strikinglycdn.com/files/1f30237d-0ff9-4ac0-b1a9-44a15fd1642a/dagerusefulumu.pdf
    • https://s3.amazonaws.com/baxekojojexusol/verismo_milk_frother_manual.pdf
    • https://uploads.strikinglycdn.com/files/72c36609-6e2e-4d65-a0cb-bed648343acb/jipedexisar.pdf
    • https://s3.amazonaws.com/jewizopukuni/information_about_shipping_bill.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe279108845d092453e8ce/1606297489394/distance_and_time_graph_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/d63a6212-6d78-4970-a3ae-0758e791d47f/safe_flash_game_websites.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_off0000c8b4.bin
76ea564b3e00cd30550d5885cfece26ffb12c799ada01d4c7bb88d01849e7a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 5308 bytes
font_01_sfnt_off0000daa3.bin
09a49a34622775804dbf262d3f80b75387862e4aa0e33bcf76a7c2d7f9da52f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 9848 bytes