Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d91188da8fad16…

MALICIOUS

PDF

87.7 KB Created: 2021-03-05 10:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8353fa7bd2dd353bebedb82ba0cc7c1 SHA-1: ad967ebf028161b65f2955c187475c1e35d0a8e2 SHA-256: 64d91188da8fad16bcb1a55c8dda2670698ad8c286b1a43f958f54a6d5692892
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter. The document body contains text that seems to be metadata rather than user-readable content, suggesting the primary purpose is not informational but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://gimoguvi.ru/strik?utm_term=generac+gp3300+price PDF link annotation
    • http://djami.ru/how_to_change_a_rip_curl_watch_batterylxm17.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/3Rggjcq/splendor_definition_bible.pdfIn PDF document text
    • http://armada.technology/analytical_techniques_in_organic_chemistryd5fz1.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/19594688575.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/fezutedex.pdfIn PDF document text
    • http://small-italy.space/4094076008082ewt.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/sony_dream_machine_alarm_clock_radio_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/ggphiiq/833_e_front_st_traverse_city_mi_49686.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/is_there_a_sequel_to_the_dark_tower.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/73498781258.pdfIn PDF document text
    • https://uploads.strikinglycdn.coIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1ca5f892-3ed5-4ea2-9c24-32d0cfa9ba30/bowenizudarutabujitojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59a34b7-cba2-4e40-ad98-70718c9d5358/us_army_uniforms_wwii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242c5e30-1530-4893-9533-248800dd6e51/psychology_101_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5092435a-dd0b-45a1-aa2d-a2ac3d664dc1/21297303653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56712fda-88cd-47af-92c0-3c73d1124250/derecho_romano_rodolfo_arguello.pdfIn PDF document text
    • http://kopolug.myartsonline.com/85761668258.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/which_bible_is_used_in_catholic_mass.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/hp_designjet_500_printer_plotter.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 4824 bytes
SHA-256: 7dc0061b4316a95de67c7ebbac42f4e007fcca00c7eef8507cd5b3457cef8dbb
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 11192 bytes
SHA-256: a68039714550c437573304bd79222b3ceb365bcb663480f94213212a865ab9b7
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 16172 bytes
SHA-256: 852e0d6ce07a1db2e11154f4548aec4dc29a2cf073112f8b6a2b4be1be4894b3
font_03_sfnt_off0001433b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3