Malicious PDF — malware analysis report

Static analysis result for SHA-256 8374ee356bc737df…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06c7dadcd9ce649e47330e7031395739 SHA-1: 5dfaa6ffb21cf3f07c3374f707d1402788e36656 SHA-256: 8374ee356bc737df9ec13ca733e0665c7f43db776b3b204f86de2f6969c786ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=watch+little+house+on+the+prairie PDF link annotation
    • http://brukbet.com/user_images/file/85427094720.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdfIn PDF document text
    • http://orenprom.com/img/account/file/283881563.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/43940370131.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40665122612.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/28912726888.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/vopesowelurulowal.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/2324840908.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/xinawatev.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/98385668472.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/roxut.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/venovow.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/tefotemipoj.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/wusepir.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/mapewurasu.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/joxijigagijuvepanugiri.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/19135624230.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/panumaxepazunijerasosavu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/fanoxanujisu.pdfIn PDF document text
    • https://ikansambel.com/contents/files/62004648104.pdfIn PDF document text
    • http://banquat.com/userfiles/files/29726913618.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pofebirefupokaw.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/38901962277.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/zenipolutefela.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/77782678814.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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 10564 bytes
SHA-256: fae6388e46f683bad64bdb9892b4f4b1b726d22224e31f0e60043950c56098e6
font_02_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 17556 bytes
SHA-256: c77bb30b6242aa914b58c760543c6c467d94582cbd0f7a4159da60cf7e8a0666

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