Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aefdb3a9476c289…

MALICIOUS

PDF

68.2 KB Created: 2021-01-28 03:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1408617c2cfeec859da043f5cc5ba9fb SHA-1: ecbfc248f58ee412e182da8172b4efbb3143262f SHA-256: 3aefdb3a9476c289d2dde2d7fc4daafda4c86286eb5c9f0fefc66810d39f135e
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 to benign-looking documents, suggesting a link farm or SEO poisoning tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites or download further payloads, likely using embedded JavaScript.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=federal+employees+legal+survival+guide
    • https://cdn.sqhk.co/nubavojek/eJiahbA/pokemon_sword_and_shield_pikachu_event_codes.pdf
    • https://cdn.sqhk.co/momajuxu/RohdoSw/no_sniper_rifles_fortnite.pdf
    • https://cdn.sqhk.co/nuwobevina/oejfhfP/32899932522.pdf
    • https://cdn.sqhk.co/dudugetogi/fo7jjIW/47762889159.pdf
    • https://cdn.sqhk.co/lebogomatoze/ijgchfL/smash_champs_mod_apk_unlimited_money_download.pdf
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/mawos-fewabagirozaj.pdf
    • https://cdn.sqhk.co/niserutom/ghchfig/kiwowunapofupamowi.pdf
    • https://bukuduribo.weebly.com/uploads/1/3/1/4/131454389/7479493.pdf
    • https://cdn.sqhk.co/kisereta/1Aidygd/39935119408.pdf
    • https://joxobupapi.weebly.com/uploads/1/3/1/4/131454586/zumajugimimisudis.pdf
    • https://cdn.sqhk.co/mujekesire/Y56hgMM/xbox_one_series_x_games.pdf
    • https://cdn.sqhk.co/dewobube/5uH1OUD/44163969579.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/44307749367.pdf
    • https://s3.amazonaws.com/tolivajupeku/claude_debussy_arabesque_no_2_sheet_music.pdf
    • https://s3.amazonaws.com/fowonaxul/accomplishment_report_for_ojt_business_administration.pdf
    • https://s3.amazonaws.com/polojuliragam/master_in_performing_arts_management_opinioni.pdf
    • https://s3.amazonaws.com/zoromexemuzid/horizontal_line_in_xml_android.pdf
    • https://s3.amazonaws.com/sojuravewi/setuzivujigonixokumivupa.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_off0000cbbd.bin
d5cfe5e18babc5b80c899ff75da227e1685b753036ab338458e2b81fcedc5b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 5396 bytes
font_01_sfnt_off0000de11.bin
f0fc4facb7fcb6cdd7a19f1da509b2715c3268fe384036c884e096adb73afa9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 11024 bytes

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