Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c207c1aad1b8ed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85e5e3dd51740acbbb04e6b19c0f48de SHA-1: 5657883318245f61f45144a0621b8779b99338cd SHA-256: 52c207c1aad1b8eda2de7db2759f655350d3bc88f3532b5e7f687e8c032c3558
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism, likely for phishing or to download further malicious content, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=download+lightroom+apk+premium PDF link annotation
    • https://kalashad.com/userfiles/file/gimatifuwuvid.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/kininusararizo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vomipavawipilixumat.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/33114653465.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/pibisubopedalowanela.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/fevujomewejulolizisega.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/8594449452.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41cb82a75---55657306085.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/23485647267.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/60066941966.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/kekasukizuzajususaviris.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/79709587798.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/94317492887.pdfIn PDF document text
    • http://space-edge.com/upload/files/totigevuvojawuwedufug.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/97483060641.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/13281115878.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/7912865097.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/757rust7o844l3lhkvlq6vjo8f/80771397647.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/84390384765.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ano20h1vb4lkt79ffcqdfdfgn0/nuwufaw.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/fidisimum.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gafizakor.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://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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 17616 bytes
SHA-256: 9b094a75ca0d355c4323590ba29d2a4a26fa53cf3f69ecbc9122334e0b827555
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 10948 bytes
SHA-256: ea4a2fffa742f4333ee44424072c3bde3e7c873560bb5303ed3a664e96fcabd2

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