Malicious PDF — malware analysis report

Static analysis result for SHA-256 2926933bbf1c2f38…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 17:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ca098b83fdfcf0204ba1e28466b09bc SHA-1: 1dfe6ef27153e03e4a63d32125fe856455a25396 SHA-256: 2926933bbf1c2f380ece4362a8b27bf6c87a641b7ba49c35aabe8abb0b8542e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs pointing to various domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lmleadmanagement.com/userfiles/files/25228252678.pdf In PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/33497660119.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jukuxib.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/pegibu.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/verulimobulobag.pdfIn PDF document text
    • https://cardolf.ro/files/80335508525.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/weliperopowadatujufovu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/23718992989.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/57555110643.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b20e6dae---gusawulesarutasu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/juzonowelano.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/27914375509.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/fejuriturijadasuxaraxisi.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/39536810162.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/68455930619.pdfIn PDF document text
    • http://chinalabware.net/d/files/90976552903.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/risigizigorirofosajo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/vifotufaro.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/81678382787.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109212136538839.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/325146106df0e5ce02ddc5c1e299bcd3/50567059616.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49317417712.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/94563883771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=torque+pro+app+iphonePDF 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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16756 bytes
SHA-256: 1fa5077b8052d6fcd3076eae18af33db990dfa54afa2380b36f5adde2834bda9
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 10244 bytes
SHA-256: 28d15a13ae6d7ac68a986541e45cc8fc9b21c99925904228a95ae0238bb5a5ba

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