Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aeb65b1dbcd9e0…

MALICIOUS

PDF

132.7 KB Created: 2021-10-10 19:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e42b9a17973f3f4c705554fd37220eff SHA-1: 6d09b9ad731c166ab63276e4e1b7d87635e38033 SHA-256: c1aeb65b1dbcd9e0cce22d5225e1866a7c297d5383316a50363b934f99cd8182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=the+activity+of+ap+endonuclease+is+involved+in PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8fd7624ead6416642433c6d1d3b77111/figekowavu.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/raxozobadenupitixerom.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/71010731004.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zamutoma.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/datitobuxezonenud.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/18511724625.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210908182048.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/94792684992.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/46681227418.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dixuxezavufopotijuju.pdfIn PDF document text
    • http://przybyszewski.org/image/file/gaguzevelafo.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/janapadotatezadewone.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/mifajejutunorawolir.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/luririlisuveweka.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/61699532140.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tuxerubosubidobivu.pdfIn PDF document text
    • https://el-tall.pl/pics/file/55263480902.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/webufudiwax.pdfIn PDF document text
    • http://mqskin.com/luutru/files/xifuxobuxo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/segamofegowedudakadave.pdfIn PDF document text
    • https://siroyensao.com/upload/files/12788996658.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/54869757870.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zoposafaxixofada.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_off000197a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001afb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB7 22892 bytes
SHA-256: 506b84a4a827cb8a448b389c5621480bdaf30076127edea8ae3797fadd5abb4f
font_02_sfnt_off0001eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB03 10860 bytes
SHA-256: a42c2709efa4e606c8cccd9ef9b59dc6b03f545cae0dff83097227b219963774

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