Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8a7e22d59b0c87…

MALICIOUS

PDF

82.0 KB Created: 2021-06-06 11:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0480637d973900b0dce8118849cf3e3e SHA-1: 21e475247fb3cb84bc70fe2005bdee33d11f6868 SHA-256: df8a7e22d59b0c8716dae134cc1de0c8308c56614075cf49c4ff28187748425c
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are SEO-optimized and hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a QR code lure further supports a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/pbw?utm_term=ring+video+doorbell+pro+installation PDF link annotation
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/0b529.pdfIn PDF document text
    • https://dumamigurox.weebly.com/uploads/1/3/4/3/134336195/kuvegiwurenakogu.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/xifanugoxakoju_dewubukujopewun_votapudad_gival.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/e9bc7222-4a91-49f5-b87e-53b91eafabaa/machine_learning_tutorial.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144445704/84705045075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2ef976-8e4f-434e-b450-6f9f491f4791/texas_master_electrician_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfd9e3c-4d89-4486-b9f3-a45cd95366e3/best_self_help_books_on_audible_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaf324d-222d-40df-8c8e-d907ceb6f902/35647145776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e191eebf-d330-4abd-9af6-a53dcf4bea44/delirium_lauren_oliver_booknode.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144649593/how_to_reverse_single_phase_motor_direction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7cc1a5-2f7b-4a08-a32c-5a06820a2d5b/61558025226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c48c88-eea1-4bb8-82dc-06cc940a3731/nursing_anatomy_and_physiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ab8d7c-f320-41b5-8734-89bf92e4cb68/jupedeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83aa71e3-e567-4402-9f79-344756b2e847/57751098880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da450282-eea4-4f40-8641-6c1991e7f5d8/non_chronological_report_template_year_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751ee6e5-1ecf-472a-8545-a561652749fc/how_to_reset_a_weil_mclain_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bcee3c-7504-469a-b383-a106fc1ae754/what_is_reimbursement_of_expenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216bbd81-4e00-48d7-9799-9362452d3cf0/modern_database_management_11th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4680cd3b-60ca-481a-bb68-e02035ea8bb2/who_was_in_the_original_broadway_cast_of_les_miserables.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/95762081238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e82b191-3267-4846-b795-55140d1c1e1b/84330201416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad1706a-d323-4a2a-961c-b0f3e6004095/vanezomevekon.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/76612842723.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_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 5332 bytes
SHA-256: 9a810007c137610d400e62aebe11fa7a0752f2e91a6643daf33ee80ccad1b2af
font_01_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10768 bytes
SHA-256: 57acd0b1eb5bd942543904ee95a3114cdf57d85f1c9ec00d528e2d99aa8cd611