Malicious PDF — malware analysis report

Static analysis result for SHA-256 6873df6845a47b11…

MALICIOUS

PDF

79.9 KB Created: 2021-05-10 17:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e2921a4824e63e9315a6de986d0e9e5 SHA-1: d3898dffbfe19b168e31e1a2b13ec209f5cadcbd SHA-256: 6873df6845a47b1183d1e9a8355cb6540486a1489abb892d3987709285a8a2ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The primary malicious URL identified is https://jumiwimov.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing site. The document body, though heavily obfuscated, contains references to 'nail places' and 'baton rouge', suggesting a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=nail+places+in+baton+rouge+open+on+sunday PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5fdaedf1251a9.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/17047868158.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/zinunorirejowo.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/tifotojujiwezuf.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/the_crystal_bible_judy_hall_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_60094c454057e.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/17847840368.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/oxford_discover_2_writing_and_spelling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_6047e9ef4334b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_325c085064d5424c89b25ac5a44cacd2.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_9b393eb57695491a9f6543f3599c0967.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/kaxepetufafewululasalobo.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/how_long_does_it_take_to_get_shipped_to_basic_training_navy.pdfIn PDF document text
    • http://bubomixutiw.rf.gd/are_browning_shotguns_still_made_in_belgium.pdfIn PDF document text
    • http://gepaxeli.rf.gd/fivawopejewoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/nusizififuwikas.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_4190bdf687a349a3ae1e5e4ab9418c97.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_1caf8d9ab62845aa9be2907d2542c230.pdf?index=trueIn PDF document text
    • http://sekuwomexapa.myartsonline.com/quran_with_urdu_translation_and_tafseer_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/regarding_henry_full_movie.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_249d2694812d417096e138c08f1d19a8.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_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 5452 bytes
SHA-256: 054e0257f1a8055d16ca1a4300fd01c9fd7b0d46d1a6ad764e8a9c61d75581d4
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 11792 bytes
SHA-256: 62c658feef199b00299eb62556e7839201fcce40cb09b8bce3603f00cc7be860

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