Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0b23705f5ade8d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 16:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a07825256f810ca3796555173f5c50c7 SHA-1: 7e0b2738881baaa350fb8941248e29ee7f140099 SHA-256: 3e0b23705f5ade8dc5c1816f0444c3cd5964148df8165b5fc816497ed8acc5a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, with one heuristic identifying it as a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier output strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://arredamenticucinesiciliane.it/userfiles/files/93446168044.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/27052738385.pdf
    • http://eyupsifalibitkiler.com/resimler/files/tinokonakifajusaso.pdf
    • http://autoachtercamper.nl/userfiles/file/namivejazixejili.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/43418785636.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/10696727177.pdf
    • http://thaiboxes.com/piceditor/file/77206668411.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/48551963748.pdf
    • https://fertilizerproductionprocess.com/d/files/rijid.pdf
    • https://johanbjerke.se/userfiles/file/24478044291.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/50785429089.pdf
    • http://brkvinc.com/userfiles/file/96934538270.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/rubuwodedejov.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/zifatasitetupafarizel.pdf
    • http://klusjesindex.nl/images/uploads/17090565052.pdf
    • http://bakersfield.thepokeluau.com/uploads/files/fejuw.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bf6f693f87b68bd19bd2351c7163fe2c/53140711111.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chipset+redmi+9t
    • 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_off0000d1e4.bin
0718a4af0d4079ebcd11b380bf3966ba380a925e8d9d748d5cacd35576905aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 10424 bytes
font_01_sfnt_off0000e989.bin
79b7fd351a9891052ebefb2fc878ad750e0a17bf48a25c95aa1695ec4aee1197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 18280 bytes
font_02_sfnt_off000118d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes

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