Malicious PDF — malware analysis report

Static analysis result for SHA-256 61548531a5d60ac9…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 00:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da385079ef70c66c1f6782188d39951f SHA-1: 613aff5727c632ba4d6e9cf6fd31f94efe6eb7d3 SHA-256: 61548531a5d60ac90a01daf594a65514d018a6663a2ac5b265ac3d76252ffc29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are structured as link farms, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=speed+downloader+android PDF link annotation
    • http://jullien38.com/ressource/site-image/files/gexidoti.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/95254986484.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/budamuj.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210909_203206.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xowawepubej.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/98138229268.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/68316864067.pdfIn PDF document text
    • http://zaiger.ru/img/file/vobikizofonobekugan.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/tunemotobifetobefo.pdfIn PDF document text
    • http://infosierra.es/images/editor/zirukibu.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/49210207416.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31af987be---gofumunuwedov.pdfIn PDF document text
    • https://eternalbliss.net/file/59325525779.pdfIn PDF document text
    • http://sbkf.org/files/files/rilalikoka.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210907_864BC88C81946748.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/negevajifebuxunuvokaxod.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/kaluvurujopuwa.pdfIn PDF document text
    • http://schubert-hh.de/image/file/46757027833.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/fujonuvatevagemuveno.pdfIn PDF document text
    • http://travellerisland.com/files/putawizapixutexa.pdfIn PDF document text
    • http://feg.vn/uploads/files/pelipitema.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/patiforetadinofakujoxija.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/72676151021.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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 10280 bytes
SHA-256: eb60a37a970ffe95069fe2a13f286ed1bbf71f018fc1b98f304d4171154f42a7
font_01_sfnt_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 14728 bytes
SHA-256: 9c0235c0da37722be30c747060a431a33a17c5ae88e0df7bc31466f63bc922c4
font_02_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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