Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95026b67554a811…

MALICIOUS

PDF

84.5 KB Created: 2021-03-19 06:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 68615aec225bc70efc867503c39f0072 SHA-1: 219036a5c1978701abe5647311bdf2bedf269f64 SHA-256: b95026b67554a811fe655d2d1beb91cb8fa0643d299c0b69dc908eb470340cd2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a carbon monoxide detector manual, aiming to trick users into visiting malicious URLs.

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://xajibur.ru/strik?utm_term=first+alert+carbon+monoxide+detector+manual+co400 PDF link annotation
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/a18c19d3d3fd8e6.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/figewene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_604926ce97858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fe33a8a551f7.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/dkhhnyh/langrisser_1_and_2_switch_review.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/8939525.pdfIn PDF document text
    • https://bajipupetezin.weebly.com/uploads/1/3/5/3/135315063/sogujigujozelewuleg.pdfIn PDF document text
    • https://cdn.sqhk.co/zedugixaka/BoPggkY/gafalogolipisimoreki.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/dufabel-lisenu.pdfIn PDF document text
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/5dc78bbf2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fcaeb971e23e.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/56299014-2671-4461-9113-0d82273c698d/67899242963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce88a0f4-7215-49fa-a8c6-e281a3287d17/hp_p2035n_printer_driver_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad013e88-657e-4d52-86fb-2c6905fe2b47/39679469710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708bf31a-ed38-4339-a71b-de8d12d59d64/dremel_4000_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c1c2fd-7af2-4fe7-8528-cc51c0d50ceb/nunileje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a5fc9a-d433-4dda-9d88-cd3e629c628c/danby_8_000_btu_portable_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee0498f-4327-4a53-8813-633964f6c0d4/xarigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cdab0e-edc9-428f-8dfc-b33f8bc24d72/what_is_safety_osha_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b0a27c-a409-4759-8fba-8ae1afb81ca9/how_to_call_unemployment_washington_state.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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 5476 bytes
SHA-256: b6108046d2f072638f3da9533bc8e1aca303e87b2c60cc88a421fd45a4187cf6
font_01_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 10328 bytes
SHA-256: 78475119c5feada1e02434528c9f48db878156a5298edf8ba856540e1131c218