Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6402bd41d4b4874…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 13:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d113f98ec28a64512cb427c1681fb4 SHA-1: 48b02c5885c7c8dda4bd32eada494930b4ae58ad SHA-256: d6402bd41d4b4874713155d931ebe818b2e53a5730be3e62ce8c283a307f5a41
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=trap+adventure+2+android+download PDF link annotation
    • http://union-montage.pl/userfiles/file/bimolazolupeji.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/wigigivagerodatekoj.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vamoto.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/8725208359.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/sagaxalobijini.pdfIn PDF document text
    • https://gdaniec.com/upload/files/jazafasudo.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/87174465991.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/46503209328.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wapebevi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/zuboruwobufusi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/79356603048.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/67632058497.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/pitobironutesobesekawev.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/72397565843.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17852838769.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/73133247285.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wamigalip.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sotumunitusubakediwuga.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sitozozurej.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/narem.pdfIn PDF document text
    • https://huanghecables.com/d/files/kekixozizimix.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143380ad0d79---bagezepopawiv.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/30441596237.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/55470682154.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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10552 bytes
SHA-256: e595d3b7c2427f38d3f65485a23e17a07e792e87a6da241312f2b8089c27cbe3
font_01_sfnt_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 15516 bytes
SHA-256: 2121b00ceba109557ed50f087552bdce9f874a1bf0883d383f2e2f2c6f855ddf
font_02_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1