Malicious PDF — malware analysis report

Static analysis result for SHA-256 8680762e776e3b12…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 17:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b25dfabb20ca25b238e4c5b5f0d306e5 SHA-1: da411d0d9a9f0d9dafa3d90a7dcce2969683a7fa SHA-256: 8680762e776e3b12a90127338ed559d9497ac5e0ca834bc422c4f763f5ee02f2
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains numerous external links, many pointing to disposable hosting, and uses deceptive content to lure users. The presence of embedded URLs and the heuristic 'PDF_SUSPICIOUS_LINK_LURE' indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=pixel+3+xl+instruction+manual PDF link annotation
    • http://meblik.su/mewubeiqnez.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/aharNuJ/rope_swing_fails_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/fhjfjie/vixudesesofunupozewepuri.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/how_do_i_charge_my_pocket_juice_portable_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/gjD0hgj/95034584872.pdfIn PDF document text
    • http://ig-about.net/zegopinirupogamemamfkwg.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jjb5cfa/ultimate_epic_battle_simulator_macbook.pdfIn PDF document text
    • http://socialwave.me/ben_10_games_free_apps5sx0f.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/cdc_guidelines_post_splenectomy_vaccines17man.pdfIn PDF document text
    • http://fridgeservice.ru/what_does_the_mark_of_cain_mean_supernaturalynbzr.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/j8i3Mgj/connect_the_dots_for_adults_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_d03d8e4a63e545029e58b2535669fe1a.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_ef2c484dc8c44a5a98651d150c7412aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e93923-af26-4320-94da-5f10abd9381c/t-flight_hotas_one_ace_combat_7_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e4b528-044d-4dd5-942f-2b816e664d08/51374459709.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_2cc2a9ce4c9f42ad8f76241ba72474ed.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_977900d1f95947df90b9426c0006d39c.pdf?index=trueIn PDF document text
    • http://masemipeba.myartsonline.com/business_analyst_books.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_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 5180 bytes
SHA-256: 5163034e14c825bf13f56b5bad5e2e537304656cf84f69aa7a329851c7275550
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 11060 bytes
SHA-256: efc8391149fc466cde253f3671bf3bd23ed02d868d2f4293cf161388c8d21f81