Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c7288344cf2a6f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 02:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a05c69eb5fd0a15a6c742bfbc8b5e93 SHA-1: 80762844d4a545954021e4ae4e34485e7e15573b SHA-256: 59c7288344cf2a6f05888eaa6199869cb3456f6a2d7c57e646c08beb14e8ee8a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the presence of external links and the phishing lure suggest an attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=enable+gpu+debug+layers+means PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/44506286450.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a855cdf11---24217009992.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/penewap.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/devowuri.pdfIn PDF document text
    • http://ropesadventure.com/d/files/kibekajufadew.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/45082851045.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/63644137280.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/labigakaziteluvemipi.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/fegipu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/99533695518.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/lisosel.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/97088919246.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/26055457173.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/abf5dff57225ed137c88b81c06a19335/61433756771.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/92982564804.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/34366204541.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/85125166528.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/24315642907.pdfIn PDF document text
    • http://halaljones.com/uploads/files/76950550463.pdfIn PDF document text
    • https://schmitz.cz/res/file/siluguziwewukigagekezer.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/gefejel.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14683283184.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_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 17948 bytes
SHA-256: 98d910e9477422c439fc93f8fff21f3daf2768d2dc6ca8fca13fd166f48ca52a
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 10764 bytes
SHA-256: fcb4ed5a583d1f86621f152dfc1daf6485500602416a0c1caa051bb6b6ced40f

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