Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b3546cd6076775…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 18:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cd1fd51d5459a2ff5742aac21e988ec SHA-1: 1dbadf30969c8cce0dcef670d7bae14393701215 SHA-256: 97b3546cd60767757aba1bc96cd833821725277761296a831dfca54c2f349175
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://bajkolandia-leszno.pl/userfiles/file/79973650272.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/pepifewirikivugid.pdfIn PDF document text
    • https://megashina24.ru/files/files/72080913062.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/lorewixoxabikebewabixujo.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/fugepaketokazu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416accbb39a---91836062599.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94442490838.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/95487785965.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vefopekogojomisurelivi.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/38539716096.pdfIn PDF document text
    • http://bubb.cn/up_file/file/85322944736.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/84778309621.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/49347843514.pdfIn PDF document text
    • https://ka-base.no/images_students/files/56162673302.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/mepabepuzebiwefewamo.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/1680912155.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb99bbb52---81443462968.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/vizojel.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/ninef.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/81257448294.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/tujikogu.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/60764143947.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/jaxaxefil.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/dagevefulosiduxifetap.pdfIn PDF document text
    • http://newo.ru/files/files/83327897655.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/tanesogi.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/14970657296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=combustion+reaction+of+methanePDF link annotation
    • 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 10824 bytes
SHA-256: 835a3117d510990147f26347b55d4337ef69e2de0d8de5de76013aadbfb088c3
font_02_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16592 bytes
SHA-256: 788b446626335256ae4bfd74fb1702813ef17533b2f96cacb11a2168016a6546