Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbe03a0cf3adddc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a864944520c3877f8ddc6f0e4953437 SHA-1: e425351162109876f4d9176dee3870b53488d8cc SHA-256: bdbe03a0cf3adddc6304b8d8c9a2c6c37aa67dafc73723fa71911cf0436cc482
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns suggest a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=download+caller+name+announcer PDF link annotation
    • http://defhjdrjioo.friend-match.com/upload/files/gixevavogeluvupetuk.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/38149589729.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/posedef.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/xejogevizana.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/dolerinilatikefuzodid.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/jowemofujemusazosakoro.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/zugagukuzugilagoru.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/bodibal.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/majifegijoxixoxi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rukasidawotirukimodox.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73320766179.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pepodoporuwer.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kuzega.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/64616875212.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/91575702215.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/54998916585.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/94259552992.pdfIn PDF document text
    • http://kisito.com/userfiles/file/natosenanokubej.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/biwasumujowizironuka.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/89020146683.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/70346058085.pdfIn PDF document text
    • https://geniodelweb.com/file/61700032938.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16313708892923.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e4eebc7398575cd017003be77c1201d6/wujapusu.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/satepi.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 18660 bytes
SHA-256: 145602a3c1c5973cbe914aab3483b2442361b07a8666f8e96473e1acff058e34
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 10360 bytes
SHA-256: a381aaea723565706c9ed5fb8ee4a86e3895e125b63ae71ef4ea2dd66ebc914f
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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