Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9254b19d5a2592…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 22:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a2904726d3b7a6344b71a27fe8ac48b SHA-1: db8e3fc28d5c4d2ae852dd82858f4c8d7b7ef276 SHA-256: 3d9254b19d5a2592691ac0ed3f2d7977b67c032071c7819ce01a11b49557325b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=what+is+obb+service+in+pubg PDF link annotation
    • http://dallard.fr/ressource/site-image/files/98833964543.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/32922221562.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29924719799.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/modutegezidulasi.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/429780540.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/xidotawemowofujuxemigize.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/subalisijupav.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/39506424782.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9159d31f---laxum.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jokojulutusazawewunasi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/37619377678.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/64414777162.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/64773151011.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xobaduwugorozas.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/48250039301.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/52949263160.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/jifomelipoguga.pdfIn PDF document text
    • http://goldia.cz/data/file/69963345204.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/42044735963.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/dezazukasibawumetul.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/gisukedewagazixunet.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kibawokusakowafiz.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_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 21912 bytes
SHA-256: c8f4a42d77c7f067aaeb7d430f80edd93f312d4278003860261a13e61f4eea95
font_02_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 10908 bytes
SHA-256: 644c200222ba093b2ed8e53a508b4d347f4511af5d881707967fac2e884da4e6

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