Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a524098c130898…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4bbd8504f9991f870d6010cb35fa371 SHA-1: 42271adf500df3c1567111655fe0d2d34fff7da5 SHA-256: f8a524098c1308985cf25fdfb507a329190f6b0361f622ffd6cfdaa47cc3edd9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document with an action trigger, typical of a phishing lure. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=new+york+movie+download+filmywap+2009
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/pibeb.pdf
    • http://ndt-tl.ru/upload/file/93154284492.pdf
    • http://matsusushionline.com/uploads/files/78135015119.pdf
    • http://cannamelis.com/userfiles/file/18692221708.pdf
    • http://ph-easycome.com/userfiles/file/jawolawatonu.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kekenidukirixonexawifujum.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/29486240009.pdf
    • http://arci-mp.fr/admin/File/75260330088.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/gilunifow.pdf
    • http://chingyi.tw/userfiles/files/75053732522.pdf
    • http://www.celso.org/download/zurulesilikusanulifiwi.pdf
    • http://huiking.cn/uploads/file/160411412439.pdf
    • http://linza-market.ru/upload/files/97805546586.pdf
    • http://ownlines.com/upfiles/file/53865755596.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/51968352311.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/29768477811.pdf
    • https://cebrigantina.com/025-CEB/images-editor/file/goluwimogukezadefefelibis.pdf
    • https://togeltop.com/contents/files/genatebuzeba.pdf
    • http://full814.com/upload/files/927404360.pdf
    • http://giteduguedesboires.fr/userfiles/file/90587859619.pdf
    • http://prochem.vn/images/uploads/files/37540476025.pdf
    • https://sibservis.com/ckfinder/userfiles/files/tepov.pdf
    • https://cvsc.co/userfiles/file/31742404189.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acbd.bin
7867394de99f61976b254f6eae50a9978db425bb52058b100948bc88af985d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACBD 14292 bytes
font_01_sfnt_off0000d079.bin
015838aec8d95627ccaf3c68262dbbbde49dfc4099d96456405988dc83f1958e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 11136 bytes
font_02_sfnt_off0000ea87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16792 bytes

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