Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44cdc17ffb52921…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 15:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64424e42a5032c31df58622f7f064d20 SHA-1: 0d8f05d04fd86262ac2c1e7b53085ff068590f47 SHA-256: a44cdc17ffb52921bacbd4d4c1b945700fbfab21943c492d54ff2b305856752e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=how+to+flash+any+android+phone+with+pc PDF link annotation
    • https://childprotectionindia.com/lexcyberia/userfiles/files/zumexa.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/mukububabelusok.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95398066350.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/guvax.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/11591047011.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/55128327782.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645f90262a---zujepiremakugugufosiveg.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/19801614751.pdfIn PDF document text
    • https://sanidom.pl/img/file/ronitumesepepadusudukebuf.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/bijasoxavikurubiroxowofad.pdfIn PDF document text
    • http://gespk.com/userfiles/file/22771929557.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/96233760832.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kunelowumogiguwufame.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/resofigaf.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/fososemamananumokagamad.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tepitovopoz.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/74316816099.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/99034692846.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/671180262.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/gutabiwofabuxijosorabe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/21501921871.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/70746186610.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/57611167252.pdfIn PDF document text
    • http://cribpointonline.org/cribpointonline/userimages/file/narofomuze.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 17684 bytes
SHA-256: f926e797aa5837a9e075d2ffa9103f22f0b7de2cfca2ece6810f7dce636792f2
font_01_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 10908 bytes
SHA-256: a9ea83ca25870c1a37076a86fc1c847f1aeb49b6a41245a289389d7f69250a60
font_02_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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