Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b478f4ba57b684…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 05:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de22e24e92f2b7b3e455349224707c11 SHA-1: d951d9de8879843d142b6bed613246d3d0d2cb69 SHA-256: 02b478f4ba57b6847f0b258ee76a6bcf87491a32f4308f981283937078f7b25e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'office procedures manual examples' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 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=office+procedures+manual+examples
    • http://forovasax.medianewsonline.com/zujudika.pdf
    • http://kulotufiw.mypressonline.com/tedemusunejaw.pdf
    • http://ninotekega.mygamesonline.org/sacred_marriage_gary_thomas.pdf
    • https://cdn.sqhk.co/makubeku/gijidhd/pibajekixizedo.pdf
    • https://cdn.sqhk.co/kogujipubap/j1jcgeW/stack_on_gun_safe_lock.pdf
    • https://cdn.sqhk.co/xurazegoba/iWmiehg/33774389814.pdf
    • https://cdn.sqhk.co/tezofugowura/yjjrjeT/google_sheets_shortcut_merge_cells.pdf
    • http://gosoxegekiri.mywebcommunity.org/66896396845.pdf
    • http://kesuvajeb.scienceontheweb.net/stainless_steel_bolt_tightening_torque_chart.pdf
    • https://cdn.sqhk.co/lijipatalenu/dnFhbgg/78741631983.pdf
    • http://juwupexutaval.mywebcommunity.org/balidanasuvasonuf.pdf
    • http://lowufadit.scienceontheweb.net/94939894528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rekawexuretowo/bhojpuri_ke_gana_dj_me.pdf
    • https://uploads.strikinglycdn.com/files/281ac717-356f-4262-8aba-32a7845f3322/lodububibefisafosoroxum.pdf
    • https://uploads.strikinglycdn.com/files/111d1c78-27d1-4f4d-bef8-c5d9a3ef6436/h20_x5_steam_mop_pads.pdf
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_81500d5451a64fb4a17d0fb0afda4754.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_f6c552a062024e459f63304a0ab7de56.pdf?index=true
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_c16a3c49401f44cda634b0f2af025b51.pdf?index=true
    • https://s3.amazonaws.com/tojazudibumogab/tipos_de_bocio_tiroideo.pdf
    • http://mizetum.onlinewebshop.net/50611147405.pdf
    • https://uploads.strikinglycdn.com/files/7efd63f4-c7c4-4552-8caf-c1c17f0a8c98/xotilokik.pdf
    • https://s3.amazonaws.com/rogugagatuf/18709236608.pdf
    • https://uploads.strikinglycdn.com/files/654a22b2-17b9-4b87-a46a-5d0d50ffb064/musasonobisivajazesixu.pdf
    • https://uploads.strikinglycdn.com/files/f99409c6-265e-44e6-9a8a-bf5091e8bbf3/mechanical_engineering_universities_in_florida.pdf
    • http://valupakukav.myartsonline.com/how_to_connect_garmin_forerunner_620_to_wifi.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b142dc49ef6f4baa95b851a1ce9df6aa.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f6.bin
a31c65fa50c11ffa623b53e9667305bb23a75f76784fb272f5cd01bee7a954d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5396 bytes
font_01_sfnt_off00010a40.bin
dda82536bb690f5c95c06b073531d36317fbab4be0ea62a42239dc2ce5322972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 10232 bytes

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