Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e392092bafe5a6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 05:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b0be1513757f329f245e29c388c682f SHA-1: 8edd561da95a8464bdcf11d32a2e9946a5c4dfbc SHA-256: 21e392092bafe5a600dd1093ed715b7df8cbe36e92a7b9106010d562665c34e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/23451297425.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613e16cc720a0---riripelugel.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/86418664098.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219151726523414.pdfIn PDF document text
    • http://hejia-ele.net/upload/85166135746.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/kulanuwirixulete.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/seforililulano.pdfIn PDF document text
    • http://gerocuki.hu/user/file/forajuvagizati.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7b632830---40820079311.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/nebotonenifefukabitakazun.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/mapuposepujoguzutetuvegi.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/diliki.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3dd7b2ad43bceefa1f86a18a582bc642/51818955221.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/xemekixiboxabosut.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/94627965501.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jesunajutigiteze.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/82224019986.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/rubopibiwilafiboruxu.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/80588489108.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/dodexodisapoge.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wunutufunitajuxavomaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ayana+lako+diaPDF 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 9928 bytes
SHA-256: 16e7aab0cda8ebc71efd6529426ec56f01e5e66ce64ab34424dc9c5d1206f793
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 17776 bytes
SHA-256: 717624c4f65ae55d63cb76f4c2d9b0b13b2ab5cb423a52b6e72d1dba8ab84006

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