Malicious PDF — malware analysis report

Static analysis result for SHA-256 c402b3f22ac7ab67…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 325d1c5373e545db7a666f2fdc0f825c SHA-1: cc807c56853656bab5e599feea383eb93eafd008 SHA-256: c402b3f22ac7ab6736dbb56be18eaa60c99ca614a79d154222ce82bdddb81a64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host numerous links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+connect+android+tablet+to+internet+without+wifi PDF link annotation
    • https://panoramabyty.cz/content/masumupujetebo.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/mazamixemawitutekulunax.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/91003935714.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/ruxiwataxawim.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7p4sog81suq3dkeglaclvdc1nl/24168550660.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jonevivanivotatiwewilig.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/78644680578.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-18/20210918130746486431.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/wazovidi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/94798134750.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/sumodugexanobomakufemi.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/gukewibatadem.pdfIn PDF document text
    • http://talesma.com/E/file/44926519336.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130817a65f2d---21719854489.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/duretiwizedi.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39787359349.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vibudorerupitubu.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/67942096949.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/gakonopubasuwebu.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/batizikenoguzegekubap.pdfIn PDF document text
    • http://idroter.org/userfiles/files/xapuputopimediwigeko.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tegarexejabida.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/96746393670.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/61399921876.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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 10724 bytes
SHA-256: f9b37a23e7f2a8e847cb909d6b5e264b5da280dd8d8afadbed711adc75ab9ef7
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 17500 bytes
SHA-256: 0d69fbf620dcc0b1b78892ce5f9cdff2d163e029d928cd24c9c4c1369a727914