Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcf953c698af8b5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 19:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 717b3a9e0ceebe216cc1cfc7929a7421 SHA-1: 8f3545d1dca96084b78c9d72ac1eda1a85d549f6 SHA-256: 2bcf953c698af8b5a01c63ac9f3c56fc08152d99def62c224721300ad76c409d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute multiple malicious files. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan points towards an attack pattern involving directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://xn--q20b13r9leepaeb.net/upload/file/202109071423003544.pdf In PDF document text
    • http://wxeina.com/userfiles/files/63773468669.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zimurabil.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zugofitasozojon.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/banisumetogegomujevefak.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/wekiril.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/54482194392.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/xaxajenevinol.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vixudijidejedajored.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/42448047296.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/72033084004.pdfIn PDF document text
    • https://dhesient.com/media/diwudumozizojutewuwile.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sefusibax.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/2682331823.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39181197287.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bebeno.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/poxotudegusud.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908103424_1848666918.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tosemixifibopete.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jobitujibefisoku.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/24994464418.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/bovunebotob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+captain+america+online+free+123PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10912 bytes
SHA-256: 0f1fd54ebdb8f4c83dcea4fca3416f81a06f0578fd89fe37b392a8387426f8ff
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 18036 bytes
SHA-256: 957b362f78f0d4ef203d7c2ee119133902605515f68be9d54b54bc6876493f67

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