Malicious PDF — malware analysis report

Static analysis result for SHA-256 f995ed783abe5055…

MALICIOUS

PDF

80.0 KB Created: 2021-02-25 18:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2760f7c898a37d68bbcc308fca075c38 SHA-1: 48cb236aec208d46e162612da4e2da1da4f8454f SHA-256: f995ed783abe5055141e001d2346c5a287691ce0d937b054e7f19deb54c8b5b4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=pokemon+emerald+instant+egg+hatch+cheat PDF link annotation
    • http://dosijefa.mypressonline.com/xupupoduwipafopuzumojun.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/LB3gjlm/drunkn_bar_fight_vr_oculus_quest.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/7769555.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/zibRpgg/street_fighter_4_tier_list_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/gChaNhb/countryballs_jokes_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/lewenowaxer/jfRhhjh/dead_ahead_zombie_warfare_wiki.pdfIn PDF document text
    • https://pefesasorib.weebly.com/uploads/1/3/5/9/135972127/masodosobib.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/kivarefoxegavowikeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/johhjfc/lost_river_cave_boat_tours_bowling_green.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/e7ee92971fa537f.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/icgchfV/hockey_apparel_for_youth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/kijopakekuxagadaporiza.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/the_count_of_monte_cristo_short_version.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/phpstorm_code_formatting_shortcut.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/xexalewiwisusasebalodoto.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/calories_in_a_small_wendys_chili_with_cheese.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_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 5420 bytes
SHA-256: 604a54c320060e0f9dee570ebe0875e9a09a49c67f4806ff678d8381e5303146
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10584 bytes
SHA-256: 41bf189f4d5dc2b92bcc1d01f3e95619d3151551417198e50caaf5e2ccc9800c

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