Malicious PDF — malware analysis report

Static analysis result for SHA-256 2398481b7b8feaa8…

MALICIOUS

PDF

77.3 KB Created: 2021-04-03 07:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 190b61fa7b5cc0aae61913b029486618 SHA-1: bd2b2c2594aed0d32ba86c585a5451624084bd2e SHA-256: 2398481b7b8feaa87f91f3a3790ba0b83c3ddb5076d6924903a09fe0cae0dbe4
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=echo+gt+225+carburetor+rebuild+kit PDF link annotation
    • https://cdn.sqhk.co/pepupiribojo/UWlpjgw/70270550466.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/cijijha/bosogusideja.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/historia_del_estado_de_mexico_desde_la_epoca_prehispanica.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/VOehmTL/gerujevapavanem.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/aibgjhh/low_level_barrows_guide_osrs_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/RTDDhfa/legends_gamer_tabletop_arcade_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/0a13p3s/bomberman_2_retro_games.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/I8jghjj/infection_preventionist_nursing_home.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/82794658202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08028345-7211-444b-8b51-18937e13b098/epson_artisan_810_how_to_replace_ink_cartridges.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_34c9381560f04f80a02709d2afa30c11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e9cc70-b55b-4600-9aad-1a8bbc279413/how_to_access_tp_link_tl-wr841n.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_7c1b30e7eb814756a877c1c5cd540c47.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_e5bbfb333f834c27ad3516faddef5622.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_e75ae5d4997c440eae2497a6b41d2eba.pdf?index=trueIn PDF document text
    • http://firiwigisu.atwebpages.com/brother_dcp-j572dw_ink_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3901c5-295e-463d-bd96-28c82929e6f8/emerson_smartset_clock_radio_manual_cks1708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b8b586-0114-4d7c-9cdb-c73c4b61e28e/how_to_login_fb_without_identity.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_51c28366e6b5450e86cd1189bc44453c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34b077a-a77d-4a44-9dcf-defc40697a03/how_to_stop_panic_attacks_and_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b5fcb8-a213-4377-9240-0913b696118c/40374771597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f546ef-697b-461b-8099-80a624902185/whitfield_pellet_stove_troubleshooting.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_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 5440 bytes
SHA-256: 0961ff12aa5c5e14e2b1056840e52467a9fb6cd8a756a471cc56eef7d500ba2f
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 10812 bytes
SHA-256: ebdf8a49cd836076d18d9d91e6e970cf8f2168bd754cf69531e88e5963c028a0

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