Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b2c78f56da41a2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 17:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5b72ef61d4e1d23484294a0baba60c7 SHA-1: 77631d8db3f9409f8bfa165fddac32b58cfa456d SHA-256: d5b2c78f56da41a282d886e8e56dae75d271c6d4ae6d30cd7b9812774cb42583
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://drafthe.ru/uplcv?utm_term=house+designer+hack+apk PDF link annotation
    • http://otestmanager.org/club/data/userfiles/file/20210919030648.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44f44040---fajovete.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/lurixakaxefogajogazefo.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72458193711.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nalibarozede.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/94738041129.pdfIn PDF document text
    • http://northcity.rs/slike/files/kufisa.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/75214161189.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/50716980019.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a1672463---solisubuvepitimese.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fizedopetumu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/33685916674.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/59779103420.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/98152574072.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/86068718003.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/zuxefajavelimarawiwarito.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/xarigoxupapolat.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/dovesegesugajefijabi.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/63645971405.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tufiluzovadelamip.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/lowufebu.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/83968909819.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10832 bytes
SHA-256: 5c955522108f81263905a91688401a47ad9a80a110e47565ffe577ea76803bb5
font_02_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 19168 bytes
SHA-256: 5789f4cbcab14f4667d0eb295998eb7693fa1a3bf6c78be87f8818788183a8fa

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