Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9f7b004223cd0b…

MALICIOUS

PDF

84.0 KB Created: 2021-04-21 07:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5479cc247e7e0bf1a239463a853adeb0 SHA-1: 728fde4dde121251cd0608f69b10649c61ac1dab SHA-256: 0e9f7b004223cd0b7439c0d27259be73eb1975644f5bdd23ca6ec4e0494ee30b
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 0.9997

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 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://soxebez.ru/strik?utm_term=marshall+mg100hdfx+half+stack+for+sale PDF link annotation
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/4078142.pdfIn PDF document text
    • http://xumegexujarev.22web.org/nuwimixojiwav.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/bBmnZtS/radio_sydney_italian_music.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/ijPzjel/67893246482.pdfIn PDF document text
    • http://vajejuzex.iblogger.org/basic_hematology_book.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/zikevibiboz_gedaxumitese_dorajapadisono_jurodig.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/hbahcic/adventure_quest_dragons_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/ja7jjji/idle_train_money_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/ihaKgiu/color_bump_3d_level_121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_d47062f7d52447b4a95f276a1fe2a6ef.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_6a9ec011ef164a58a9dee8e000eee978.pdf?index=trueIn PDF document text
    • http://nojupaven.rf.gd/shankara_video_song_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66017f5-a6a6-4d9b-b28c-8d12547f41c7/florida_highway_safety_and_motor_vehicles_pembroke_pines_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b33cb1-141b-4905-9214-d5511b47aec0/posuj.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_d746aa18f1ba4b1dafc9b4917f445ee3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafd114c-28fd-44a0-8bd8-c4365c2e353b/audio-technica_at-lp60xusbgm.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/rowasafegitatikuwotos.pdfIn PDF document text
    • http://fokezazonof.epizy.com/fedex_straight_bill_of_lading_short_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc12aed4-a563-4851-8950-7b5032343d4d/watch_were_going_on_a_bear_hunt_film.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_ed0600961f684ab78df34ce5a051ebe3.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_f2dcd1f76a6c401da94d4345c5d536dc.pdf?index=trueIn 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_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 5768 bytes
SHA-256: 3543a1ef38a11010eed95d42f8f6889cf1183bc767d6d3639ea119c8dc9a0c88
font_01_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 12260 bytes
SHA-256: bdedecdd9cabd6a49a96c2158cd1e89493c5e8c39483afe274667471d372b8b8