Malicious PDF — malware analysis report

Static analysis result for SHA-256 f848bdd9c74b0836…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 18:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dc9723e72db849ad3a4fce26b2479ac2 SHA-1: 67278d11ae5ca9a4da90521eba0fc0cee1e50700 SHA-256: f848bdd9c74b0836d1322f07edd567a96c982d8f4d4be79f0d2fc0f67f68a6e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The PDF structure and the presence of external links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crewmak.ru/uplcv?utm_term=offline+video+to+mp3+converter PDF link annotation
    • https://www.borzabadi.com/ckfinder/userfiles/files/74266004590.pdfIn PDF document text
    • https://onecre.com/images/content/files/97421118869.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/fepoxasiwilojeb.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tifonimakepavagomajefemol.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/waxamaduzerekapowewiter.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tufiruzukolojabijuvinuzo.pdfIn PDF document text
    • https://shidoremicrosys.com/media/56589591183.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152cc118c3e5---fiwubado.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/64080828606.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/danaxusulafokoj.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/43120098123.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/19984138644.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/70422900094.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20210923010323.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/92249057351.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/9581113638.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/rexabedapinajuzofojubig.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905101734.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/45494326705.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wavipumatixomi.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/dabumu.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/sokukiraxamoso.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kbu2f1j2mrm9ucn9jg8s3vr2u0/737471169.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/9564916809.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/10530082294.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 10712 bytes
SHA-256: f720b45b84cbd5f4ffcee00d220e84e0cec3ee150ebc4a51ab809dec29c65f5f
font_01_sfnt_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 15404 bytes
SHA-256: 675adb61fcbe3b9c77dfd924f71a80a3f82c95296a59cd3d0c6352a300fef29c
font_02_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1