Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3d7f4f512b7bc0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64c799921fd8f39f4f3385cae7a5a10 SHA-1: c6eac014a41b52eb9992faa8bc1695a7abe22720 SHA-256: 9b3d7f4f512b7bc0f40b70f4aaa4289fd2293605dd8073b34526b1e928d999da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=show+internet+password+android
    • https://fond.ru/userfiles/file/30862302968.pdf
    • https://xnkvinatimex.com/uploads/files/23629038051.pdf
    • http://criminisiepartners.it/userfiles/files/32244302287.pdf
    • http://lnv-cnc.gr/userfiles/file/tasof.pdf
    • https://trompis-tondschungel.de/userfiles/file/3584238124.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/cfsarh5b8ujri81qkohkkre5i9/wuzaruzixewuzizuzupexu.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/83197507210.pdf
    • http://ingegnasrl.com/userfiles/files/82015540909.pdf
    • http://www.majbrno.cz/uploads/files/34280449764.pdf
    • https://et-auditing.com/userfiles/files/dopebibirajolotularejowax.pdf
    • https://kentacademymiango.com/userfiles/file/86630854490.pdf
    • http://yas-center.ru/userfiles/file/ketobe.pdf
    • http://3234.us/data/attachment/file/xobojojewusiwazor.pdf
    • http://studioaba.net/userfiles/files/dikifov.pdf
    • https://qud27rxl1-k61l.com/contents/files/29391784476.pdf
    • http://evolution-dev.com/file_media/file_image/file/zegisapora.pdf
    • https://belitour.ir/basefile/belitourir/files/wanadarigakaximoz.pdf
    • http://macautemple.com/userfiles/file/tewuwerixoxidapelawa.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/9643942262.pdf
    • http://livelyway.com/ckfinder/userfiles/files/76205763796.pdf
    • http://woodbridgeabw.com/uploads/files/25705247801.pdf
    • https://funbugs.ie/files/file/pajapolekuvedaw.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/65586257000.pdf
    • https://santa.sg/images/users/00000000/files/taxabepisofokekava.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_off0000ae30.bin
0f3dd190067ff720bb7660f9292d77febac33bc5ed521d1fa0cd026d7c9a807a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE30 10604 bytes
font_01_sfnt_off0000c66c.bin
3c4b86e81ccf70a26295add6050ba6bb6b7c052c1a55f5f41ae5e28a1918360c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC66C 15736 bytes
font_02_sfnt_off0000ee7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes

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