Malicious PDF — malware analysis report

Static analysis result for SHA-256 102c05c2b83a77d1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 19:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9754bcf0db619b69c86b5ea94294b3ff SHA-1: 8f28419fa287b05605d37930778710cda323f091 SHA-256: 102c05c2b83a77d127dfa89a5bce9be1f1fb7c4d34d7348f5388061a5709279e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests it is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alexspa.pl/userfiles/file/mifop.pdf In PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/bumajovumokekatopevozi.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/37302490173.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wepoparuxavinofetapojipu.pdfIn PDF document text
    • http://zuszdounky.cz/files/wesogamejakosuroseresi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109091159583714432aw3kpgpg8ot.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/53357016725.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/vadilelas.pdfIn PDF document text
    • https://grandegroup.net/files/koduseporejerumebuxus.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9c838012703c59512b711a7c93d51630/3126313846.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/25604964313.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/38596097977.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/23811744952.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/92400677968.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/divodasubuworut.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/5607564829.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/rugotixizonunodemitobopo.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/keludolet.pdfIn PDF document text
    • http://com123.vn/uploads/file/93390990046.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/14937865439.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/56320857069.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/41346656730.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ce6f38a---76337305150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apps+not+installing+androidPDF link annotation
    • 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_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 17084 bytes
SHA-256: 9ce74ba14be18a283fe5983812d957f3aaa8473b193f36de4ebdaabefd2d7aae
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 10416 bytes
SHA-256: 8158405824f5d57b25dffce0ea3886823bffd66f2d2dd632027a59dca444aa09