Malicious PDF — malware analysis report

Static analysis result for SHA-256 61baf0d2caaad1c9…

MALICIOUS

PDF

67.9 KB Created: 2021-02-18 21:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2d5f0e64a1bfa3bafe3965cfc646ff SHA-1: 110028974888e428dc5c0760b5f5098c4348e9b9 SHA-256: 61baf0d2caaad1c9ffa4bb2be261c268d23a503f1456dbef651fafc96f194573
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt.

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://druttle.ru/wix?keyword=sims+3+apk+ios
    • https://cdn.sqhk.co/nisugavu/Bjjchf1/lidotibarafigub.pdf
    • https://cdn.sqhk.co/mojupesonon/heti2DZ/19435615014.pdf
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/4954130.pdf
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/7233a3.pdf
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/f95b33ff51.pdf
    • https://cdn.sqhk.co/setawigiz/eZgjjhv/watch_offline_videos_on_youtube.pdf
    • http://xuzevofut.22web.org/accident_incident_reporting_toolbox_talk.pdf
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/sosulolerowiw.pdf
    • https://cdn.sqhk.co/pedidagow/jTejjjb/racing_car_2020_achievements.pdf
    • https://cdn.sqhk.co/runusamopit/yTVmvij/celebrity_cruise_line_stock_prices_today.pdf
    • http://wisitens.online/crescent_dough_sheet_recipes_with_chickensakx1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sesafefanulokam/fantasy_football_draft_espn_cheat_sheet.pdf
    • https://s3.amazonaws.com/daxemo/45073375569.pdf
    • https://s3.amazonaws.com/paxunu/sapatirubas.pdf
    • http://legofovivaxom.epizy.com/boko_haram_attack_video_3gp.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_off0000cd5c.bin
25e2f9d9f3759f84ba8f1f1b2702493d4aec0c13624d0b9be1de7d3765bb132e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 5168 bytes
font_01_sfnt_off0000dee2.bin
d9e6563dec129ab2170a8ee46be2de79e2c03ad47e8bd3df8d2b567e78a01333
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10696 bytes