Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ce9170f3e03b3…

MALICIOUS

PDF

76.8 KB Created: 2021-04-16 05:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b763c785e55dafba2fc665fb2e6f6d66 SHA-1: 10838c8a41b2acf679367070925f69c13e9ff8f1 SHA-256: e33ce9170f3e03b36baca6bbceeb1bd61f99ae987e40bb9082b6f603e95c3673
146 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. It uses a callback-phone (TOAD) lure. 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 0.9960

Heuristics 6

  • 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 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) 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://nipisod.ru/strik?utm_term=file+a+ucc-1+in+california PDF link annotation
    • https://cdn.sqhk.co/fiporalisu/fifhdkU/97666882823.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/Uih80OB/chroniric_time_reapers_interactive_story_games.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/xhhgjjf/gazijero.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/vgjtaZm/54830245113.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/cjjLnMK/24308107576.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/america_is_not_the_greatest_country_in_the_world_anymore_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/ghajcI9/jogokago.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/eaB2Rie/fajodomepaxawivibejepa.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/dexexetemitemodadaw.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/gotuwixop.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/3_golden_rules_of_accounting_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/gobamagedesi/jaxKbgj/dial_911_simulator_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/iihjthh/21666124280.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/35112988353.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/iKieie2/27555464512.pdfIn PDF document text
    • http://larebalin.mypressonline.com/sobiwe.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/62834801338.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/46058bf9-de7b-4919-be75-53aa843138b2/how_to_replace_deck_belt_on_husqvarna_zero_turn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45371fe-a334-44cc-8727-8d133c406aa0/harriet_tubman_biography_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f638b1c1-0042-43d4-b67d-250758cd9193/41584161076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8d0e3b-f4b0-40ec-a1c2-3552dc6ff20f/xegugazefatupojad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/405cddcc-f881-4d07-b2bc-68495f5608cd/lowodo.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/34976430573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1d9081-945c-470f-82c6-90d298a55b81/excellent_definition_oxford_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77825e38-4261-41c9-a100-c7e5f857edb4/lunuvozabuguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b15274-ec4c-44c6-914d-77de88407b10/72450308857.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_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 4736 bytes
SHA-256: 3be9b0494e7bf6a6ca12e4c0a387aff512593a69c81c4e718c99bf5dcba18f00
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 10148 bytes
SHA-256: 1db5cfa17ed337c68f0a3212a98a74e953177fb4932c379e54c887c6833e8458