Malicious PDF — malware analysis report

Static analysis result for SHA-256 1decda41e0554cd2…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4d2d9f98862fd332b233c4b95d585e SHA-1: 9be02775b3def1c3a97b1c94627625b2d62a0ab3 SHA-256: 1decda41e0554cd22ace4a680eeb84512c50d87e8f061d67eaee7748882a9116
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL suggesting a phishing lure related to a specific product model. ML and ClamAV heuristics strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of multiple disposable domains and link farms points towards a campaign distributing malicious content.

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://vilenefex.ru/strik?utm_term=kitchenaid+superba+oven+model+number
    • https://wuvepadin.weebly.com/uploads/1/3/4/7/134714831/7147690.pdf
    • http://tesugujinarijag.mywebcommunity.org/artist_management_for_the_music_business_fourth_edition.pdf
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/fajobube.pdf
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/bdbaae6e0f48.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/9269473.pdf
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/pixuxonunukam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nerofote.rf.gd/day_of_the_dead_skull_template.pdf
    • https://uploads.strikinglycdn.com/files/8a89b494-bd97-464e-8872-cd64ee7b7346/what_is_the_structure_of_crystalline_copper_sulphate.pdf
    • https://s3.amazonaws.com/mosezavor/mercury_optimax_beep_codes.pdf
    • http://popofisofol.myartsonline.com/cambio_climatico_mexico.pdf
    • http://fozozip.onlinewebshop.net/juxeneboweritodozinevip.pdf
    • https://uploads.strikinglycdn.com/files/b1008add-1f40-4870-9c81-395aba9a99da/samsung_nu7100_49_price_in_pakistan.pdf
    • https://uploads.strikinglycdn.com/files/9ab36f27-3948-4199-871a-48daea4d31eb/kasoxojipage.pdf
    • https://s3.amazonaws.com/nuxomigo/xowafev.pdf
    • http://kakavogulogij.onlinewebshop.net/bryce_canyon_trail_map.pdf
    • http://fokodema.epizy.com/igcse_ict_study_and_revision_guide.pdf
    • https://uploads.strikinglycdn.com/files/7094b6fd-ecfe-4ae1-b171-8e1b08373fae/67006448574.pdf
    • https://s3.amazonaws.com/joterige/amd_intel_performance_per_watt.pdf
    • http://donolipapaxe.rf.gd/free_printable_math_worksheets_algebra_2.pdf
    • http://tobizexajivuvob.epizy.com/adobe_media_encoder_codecs.pdf
    • https://uploads.strikinglycdn.com/files/296f9756-963f-4079-a876-7bcbbeecb871/32287867065.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f571.bin
60d458966db317a04e94cbb554ca16e7aded21ed5600feac5334afff583832a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 5480 bytes
font_01_sfnt_off000107ed.bin
815fb2b55ebfc1fd0d45619ca27a3c410b76f7155e2232ebaf29830864de3083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 12356 bytes

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