Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43db71ef3a84743…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 12:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ab02025153c1879b32fa38a928cd8586 SHA-1: 11e01bdc5d65ef5404e01cc007eea147debfdba8 SHA-256: b43db71ef3a847439f423f5dd2df77b3493c937291f4c87e496ffbd608504f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=fastboot+oem+lock+waiting+for+device PDF link annotation
    • http://svadbavmoskve.com/content/xuploadimages/file/barajiwuwikabaralez.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/54602829506.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c02e96c5---ligine.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/10877997248.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/87488728290.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/94608800988.pdfIn PDF document text
    • https://salonrewards.ca/images/file/38252409373.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/pajulamivaxidolixamamu.pdfIn PDF document text
    • http://dges.in/userfiles/file/zuganatok.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zilibogajojarubokapid.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/92614274874.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/gizedi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/71654550614.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/49435836829.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zexepopufimirewikiwapada.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/40363482995.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/31007060824.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jifagasavu.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nidewedurominogoboxaxirum.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/12292769987.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/70869076391.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 11180 bytes
SHA-256: 9a0709d0ab3916654e41aaf091928aa20d6da225df881c8d9c63650f4385766d
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 22504 bytes
SHA-256: 78bdefeffdce043a74677bc7768a0a94b122ed2310f43182f21dbec13c1033aa

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