Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e50215a08697bd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 01:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50b86c79985095524e1b4d252ab6cc21 SHA-1: decd90d07d9cd398e984fdcb7cc3ce29fc648c25 SHA-256: 57e50215a08697bd50ea330d9f3f38288553563128ee2ccbc4ae36f371f5d20f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=redmi+note+8+dpi+settings PDF link annotation
    • http://i-physiology.ru/upload/sodiza.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/94672045181.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/wobuninuvenat.pdfIn PDF document text
    • http://afslab.asia/upload/files/66186960731.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/7429835028.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/75969403133.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/23290934260.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/71944268971.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/22765077062.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/xuvovirabipuzenewobusa.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/40891859206.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/jarulu.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/77606087256.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/rafekar.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/53114327092.pdfIn PDF document text
    • https://senfina.top/uploads/files/62400818075.pdfIn PDF document text
    • http://js-space.de/userfiles/file/nujiduvomavuzumevuxem.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/loralujabafumufafi.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/kojolosekogepem.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/viputaxetepanezugivavu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/51442826150.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/12/xosumomaxiri.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_off0000b19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 10680 bytes
SHA-256: 3682bc9d034ab6f00e8b5127e5889ee59ffbbd5c51f4c17054641772f03ac2b6
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 15056 bytes
SHA-256: 92360f9a708a03535183a4e4e5e7413ce76f92d097d603896e0ab94c90571337

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