Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b410dd6650c79eb…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 17:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44e2af641a1121ef1b2e9cd385510bc2 SHA-1: 193a3f773bbb3693396a7da77431453c4dc6ab52 SHA-256: 1b410dd6650c79ebd8af4b4d05b4890d84e293a07fa68f883beef040b65b1c86
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites for further exploitation.

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://ponafet.ru/strik?utm_term=nelson+stud+welder+manual
    • http://beviluxenumiliv.mywebcommunity.org/how_to_calculate_number_of_days_in_year_in_excel.pdf
    • http://bexixibeguben.sportsontheweb.net/multivariable_calculus_larson_11th_edition.pdf
    • http://leziwazedo.mypressonline.com/gas_lawn_mower_wont_start_after_winter.pdf
    • https://cdn.sqhk.co/vugomupuzisa/jjdggrk/slow_motion_video_editor_free_download_for_mobile.pdf
    • https://cdn.sqhk.co/jivonaxadu/yjjIgZQ/soccer_star_2020_top_league_apk.pdf
    • https://cdn.sqhk.co/xobupuwulawe/ic2l2he/dorazalupop.pdf
    • https://cdn.sqhk.co/wetilusogaki/ifGagfw/71281334729.pdf
    • http://lojapidabud.mypressonline.com/learn_spanish.pdf
    • https://cdn.sqhk.co/sedazozesufu/Bx7jdgd/world_war_2_warbirds.pdf
    • https://cdn.sqhk.co/lamidipeke/d0ggBEa/no_limits_race_to_sunderland.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rivenoke.onlinewebshop.net/do_vitamix_blades_need_to_be_replaced.pdf
    • https://uploads.strikinglycdn.com/files/e1ddc575-7a94-4faa-b237-016c6baef4b7/rogofuw.pdf
    • https://uploads.strikinglycdn.com/files/24c28999-7d6b-4db8-9682-f00dc5aded5a/79570243844.pdf
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_c494e5ec443a45389112ba41cb5324a0.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_263cc4e4a3eb4455a2001d7073cac713.pdf?index=true
    • 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_off0000fcb9.bin
37c26aac8dbf4f5148f3ca6700b6ee1cfd26381f3bc30fc61ee86fbac32426d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5032 bytes
font_01_sfnt_off00010dcc.bin
0f72ddade4ca692a6b4ab9b1e5a8a021029f01aed7b047e67d62669d3bb9c1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 11572 bytes