Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f6654fd3c03baf…

MALICIOUS

PDF

86.8 KB Created: 2021-03-15 04:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5c916841447c0564380eef2e5a679cc2 SHA-1: dd72ff33147ecedac79af6b09e0f38a4fd373c36 SHA-256: a5f6654fd3c03baf1fcd1196646fec345abc28cda7a0a267bfdd2287f366a989
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL 'https://ponafet.ru/strik?utm_term=utopia+engine+beast+hunter' is a primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=utopia+engine+beast+hunter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384045/normal_600031d62e1dd.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/how_to_become_an_aircraft_maintenance_engineer_in_india.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fe1515a9429a.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/run_for_your_life_midtown_charlotte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5ffbba98aa909.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/6467045.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/48199645043.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/flashback_x4_dimensions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_601f81e4614b2.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/1d4dd.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/26922713966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_8e44c787c647485d81170f180d468a77.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_b82ef23cc722466f95e9154d9181f36a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojaxub/creative_brief_format_advertising.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_8c86fa58e27d41069e3e5177c7b7c401.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/arielle_die_meerjungfrau_soundtrack_1989.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/cello_sheet_music_free.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/82076371310.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/21690871496.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_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 5180 bytes
SHA-256: 57fe44bb6d62bfdaa4a6a6375c91ccdef644a3b613e9922e0cb5c229d3f813fa
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 11420 bytes
SHA-256: 0eb60c6b1602a77626de472765d79e53a25e2ef365d9827b452fa08b5fb2bb7b

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