Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a191004702baeb5…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 02:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0624d9df0180436c82dc473ff8af16ae SHA-1: cce7b8406403fc05b3847d3e107c867a96dba2a8 SHA-256: 5a191004702baeb5f0689349aeea97e4b395e559278cafa2123b99621bede93b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document is designed to redirect users to potentially harmful external sites, consistent with phishing or malware distribution tactics. No scripts were extracted, but the document structure itself points towards a malicious link farm.

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://huntic.ru/uplcv?utm_term=how+to+make+topic+in+chat PDF link annotation
    • http://artdealer.vn/upload/fckimagesfile/7ee6efd3c8b2d6628f4a0d27b21b27b6.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/a5oqr5gi7vhp6dvoaibeth4146/37778264694.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/30312093141.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/2068867518.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/xopixokinegukazef.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/31939292697.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/pisatixewebigop.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nosezitu.pdfIn PDF document text
    • http://vhz.cz/user-files/marewes.pdfIn PDF document text
    • http://df-foundry.net/d/files/55624783764.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/digas.pdfIn PDF document text
    • http://stringladies.cz/userfiles/21525666906.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109120309134118.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/32889049695.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/33254140406.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/tetofekaralibokenuru.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/51417826311.pdfIn PDF document text
    • http://soupworld.de/upload/file/68666095876.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/76958972520.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pepegemevu.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/79725547347.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/vajubozenitetuvifif.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_off0000ac32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 10492 bytes
SHA-256: 6025b936e996ab8b2561f0b54e68cad08decfc668b4fabf72f636bae650c680c
font_02_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16048 bytes
SHA-256: bd4f626de0a24ef22b331295bc12d93ed3f4e0020d3f5707f0d977e48d559d00

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