Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2feff97b2f6018…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 21:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5140765def13e13180e1181b1978acf5 SHA-1: def8c1bb3c586e3dc8a4ee413ff505751620fa56 SHA-256: 8a2feff97b2f6018fc415354ee8affc1fb8fdd97a085aecfcaf7fffea704f07f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous distinct URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://danfort.lv/userfiles/file/92732195087.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/mazur.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/93550064661.pdfIn PDF document text
    • http://esipro.be/userfiles/file/werepetode.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/pifogurisi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/af261d4b5a26f750ca3966159249386f/kokolagoguxudosinu.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/vupudi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mejomidedukevej.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/44868579939.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/venokufawejalubanaxip.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zamemesoraweporap.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/begekomugedor.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/mazujesibubufoguxofumun.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/77262409371.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sugudipixitebunibewesa.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/7945078231.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/77425484485.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/genenojemiwapof.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///12005212558.pdfIn PDF document text
    • http://askort.pl/Upload/file/bejumakefisu.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5762933067.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/zimixuwerewakofibelagu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/razosufoz.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/63339706338.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/59842765543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=quick+settings+pro+apkPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 19524 bytes
SHA-256: d621b987dbb420a4ee37e684c96992f902beace20502a3c239188a1d3417ff42
font_02_sfnt_off00013987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 10756 bytes
SHA-256: 553fc1c7cbf71b35b17f1f93aa10ef46b5e895f6756280a62b5b6dd529fbae1b

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