Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6263ea51b913fe2…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 11:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 23c4c76e9b09eb24317077878dca87fd SHA-1: 1acd37b01bae048eb8696bc2cc05e67f8e3878c0 SHA-256: a6263ea51b913fe27fcf8c599a603d5165dc7cf1b8f803710e146d77e5e8bf9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm hosted on disposable domains, aiming to redirect users to other malicious PDFs. The presence of numerous embedded URLs further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=excel+combine+two+sheets+into+one+pivot+table PDF link annotation
    • http://cobe-ing.it/userfiles/files/84274430972.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hdl92jdseldi7h1m5nh2bcafen/roxajaradatovasu.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/10995805676.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/16568040145.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/kowixinilowaf.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/wabozesibiwafajaju.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210926_204255.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/82098388277.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/taguxokipotuzenemekade.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/zipunurovilufadadokelib.pdfIn PDF document text
    • https://mahae.hu/files/files/zapusutopagukatijoxosu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/doxakuvulotavotifegaki.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73615792459.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vuxikapimojugiga.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f33d89b1d---neposuzagemimexe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gozarimitiwev.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/foxadepadikobunene.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/pewudobadozujosegoj.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/wusepir.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dusuretulem.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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 19376 bytes
SHA-256: 56c90268231bf452795f2bc6811c35c6147c1188eb492272c42da3848c811df0
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 10916 bytes
SHA-256: cc0725016939d698bcdf65c27669d77ea5719221b2b78ddb1e9bd37be68e92d5

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