Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50ac2f67719cd65…

MALICIOUS

PDF

83.5 KB Created: 2021-04-04 04:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f5f40b30ffb04a9f7114b9c68c68b53b SHA-1: 845fff2fc1e08f86615b77c1538328275a28c06c SHA-256: d50ac2f67719cd653ce4dbd4fb087a416055199a6386cfee9ab05ba073f52337
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being https://baarspo.ru/strik. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users by disguising malicious content as a repair manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://baarspo.ru/strik?utm_term=2007+lexus+rx+350+repair+manual+pdf PDF link annotation
    • http://thepropheticapp.com/launch_trampoline_park_watertown_hourslu28r.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/how_can_i_be_lyrics97gwl.pdfIn PDF document text
    • http://uablog.website/48699378758q9oe8.pdfIn PDF document text
    • http://websecurer.tech/how_old_you_gotta_be_to_work_at_rossvge5d.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/voxewa.pdfIn PDF document text
    • http://csxmoney.info/it_chapter_2_stephen_king_cameo0tt5b.pdfIn PDF document text
    • http://cookwellbakewell.com/campbell_biology_11th_edition_online3wsr3.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/aadhar_card_online_application_form_download.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/lomokidobixivejetofakutox.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/bosidrtz8q.pdfIn PDF document text
    • http://lamovingcompany.com/9276499480lywjw.pdfIn PDF document text
    • http://onsideball.info/list_of_prefixes_and_suffixes_in_englishv2t8z.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/how_to_write_big_epsilon_in_latex.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/22585051574.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/5891757681.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/4d2199fd-45f6-44f0-a7aa-4f3cd53a6b48/why_isnt_my_ge_universal_remote_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735d788e-7ac8-4a73-9b17-a80c993e69de/how_to_get_maximum_heat_from_a_wood_burning_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59d1cc9-12f1-4bdf-b3cc-12ab6dc7eeaa/29275255784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d53be1a-bdcc-4fb2-ad29-e6b25ca56af7/16425259260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e517a9-1207-4bf7-b759-6196af9018f8/54741453419.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/ignition_system_download.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/wakobagotavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64b3053-400b-4245-848b-95be75384e7a/how_to_set_up_a_bully_dog_gt_tuner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea04abec-7928-4913-8972-3ae4688c0b8a/economists_generally_assume_that_firms_attempt_to_maximize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddec4c07-54d2-4645-a7e0-49c8582745af/brother_mfc-j615w_printer_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde3978b-aab9-4d79-9557-c9deaeaf1785/age_limit_for_car_seat_in_texas.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_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 5800 bytes
SHA-256: a13009fb44819cdff7fc16a0277d18b509d3633fba3bd19529c1626fe1539a01
font_01_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 10508 bytes
SHA-256: d7b7989ad8c4fbf5c0490cd6a25b55039b5507afa41e02c9b1bcb70822c42271