Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b434f071ad95bb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 20:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f803fe3a45135ab15b6c01835bc38e1 SHA-1: c75b79e3008494fc20bd0a1c07e3c25e6ee69f42 SHA-256: 83b434f071ad95bbd10e56b103bf27e420371d42770a7d01740582d7d779366f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=what+causes+your+phone+to+freeze PDF link annotation
    • http://retco.ge/ckfinder/userfiles/files/lewatorejarerof.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/84485796749.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/nizuvibetomawurepobared.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393c7a8ce3e---61435198284.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/74102236990.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/48850644686.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/wiginog.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/tetuwabavimazeza.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/fonuposixupagupiwimixi.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/65254817454.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/zorodawo.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/kumivaso.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/bixara.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/solizor.pdfIn PDF document text
    • http://tradotel-riviera.com/file/2053807519.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/30179161636.pdfIn PDF document text
    • http://torgoborud.org/images/file/rolukumapufuwofemimofotiv.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408d13c4158---36492619790.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35591507690.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/14480175459.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xekakotez.pdfIn PDF document text
    • http://schokobrunnen.com/idata/72645305349.pdfIn PDF document text
    • http://szpk.hu/_user/file/79703660585.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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 15540 bytes
SHA-256: 459e94596c67ad6e566a7279f59572f2aeb49d638a01bc8e4e1b4cbbe3dd512c
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 10704 bytes
SHA-256: 692f2916bb9ba4354205b0d06f07205d6013d1c3d296e1de7d9ee72ba3754c72

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