Malicious PDF — malware analysis report

Static analysis result for SHA-256 13934fd41532ac07…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 16:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 62f6aec0f5bf68b2a400a7860679d838 SHA-1: 19d228fb618835d136679f4c9edd5579baf3a967 SHA-256: 13934fd41532ac0709bf2a950dfc9603393932ca530170288a5d1a618cef915f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, with one pointing to 'inwebjor.ru'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to redirect the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=signed+decimal+to+hexadecimal PDF link annotation
    • http://alhouti.com/userfiles/file/fevomibutulakobit.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/fukeli.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/nakoserutodesepagob.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/16349414351.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/guwuj.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/6345242914.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/13968020506.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/97348635479.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/wajidagajoluda.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/83877992379.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/64279586189.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/vugofuweratalalutajufumix.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/vedisosupaxipaduxajoginut.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/65148160008.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/98645756055.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/4338956419.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/tetunose.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/26748235148.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907160322885675.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lufigezuwiruru.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/jakunazodemizuzepe.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/virovajowedozofamabilopis.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/kuzukisoxovupese.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/93370389907.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_off0000be74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 10728 bytes
SHA-256: 504abaf5a56cc318536d6bf6856cf925bbde1c3e55755952b57937358f3a2e1b
font_02_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16228 bytes
SHA-256: dece3156eb10f5a91cdfb047548d8f32cf0a4f7097636b331bfa1c9762ba3106

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