Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a51b5318bc6859…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 05:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 307ef3c8e07dc92d70a69a013b1a6a83 SHA-1: d7153607e0c0cf60b0fdd17ba233665c460a8340 SHA-256: 42a51b5318bc6859eac7a48aab55db4c043c9f3ab5930deebb92c529defb9555
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is designed to redirect users to numerous external URLs.

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
  • 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://dugedepap.ru/aws?utm_term=do+wireless+mouse+use+batteries PDF link annotation
    • http://lololoj.sportsontheweb.net/how_do_i_program_my_liftmaster_garage_door_keypad_without_enter_button.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/the_great_rat_hunt_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5fe3f5ca5438b.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/dalaju-baxerokap-temukevaxe-vapuzotabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6045687547665.pdfIn PDF document text
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/7019147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_602816fd57ac5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegorabeg.atwebpages.com/kugadusakarelafenojavo.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_eacb649473e9421f8eace39a5e6e72d0.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_5e0ac792fa2a4c64acdbb646af027dc6.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_62b5a93bc6674488b2a09bc5219b24a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7246ef-9efb-47a9-9dda-fcd1e2689ed9/mukanoz.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_3aa60088320d48a093f48d02a0f49f0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f042ab-4dd2-4aec-946c-6c6beae4a344/89642430712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef8440e-812e-4f9d-ad45-2912236942f9/how_to_make_a_hidden_locking_mechanism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7d5273-69c1-4a86-9ecb-44a5b70bcda7/bufugutamakipesagapo.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_48ebfe7ee89843faaa01fee47d9b9606.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_c3e26ba62ea64ed595947ae3cf5ece98.pdf?index=trueIn PDF document text
    • http://pasifowon.atwebpages.com/what_are_good_transition_words_for_essay.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_ca9d5a4f4f584c0eb1f4cea2bd9005f6.pdf?index=trueIn PDF document text
    • http://lufevexos.atwebpages.com/wevafafogisaw.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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 5060 bytes
SHA-256: 548561ce4a7913e9b97db2e8a21d690f85877d5af438286cfcef332a912f2abb
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10568 bytes
SHA-256: 9f7741ee8b0c94923f69b39b88096ee8e3668bf766aa79d4c07b2184d8bcecea