Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7ec58987b489d1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 13:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ddc4e619912810a686c83dc33e36270 SHA-1: d06a8a5bbabce53cd70affd3bb14abf51358f711 SHA-256: 9a7ec58987b489d18028dbdd4dd1ff1833cc39614c34d7696c7547c474e82d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=how+to+import+vcf+file+from+pc+to+android+phone PDF link annotation
    • http://a899.net/userfiles/file/70776466042.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visomiwuxazimusova.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/nivaguxano.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210914083057.pdfIn PDF document text
    • http://kunbot.com/upload/files/wunawile.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/65579432721.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109080159136862.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/83031661590.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/8154258915.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/wuxaragevenijadifowubedab.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/34361865240.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/23006550073.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sevev.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35363695077.pdfIn PDF document text
    • http://393citizen.com/upload/files/46077528460.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/88659766508.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210910_203517_4758.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210913_095037.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/95815569693.pdfIn PDF document text
    • http://rapet.hu/files/98044347735.pdfIn PDF document text
    • http://bienbao.org/uploads/files/89595920860.pdfIn PDF document text
    • http://lex.tj/img/file/17054897207.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/28024273530.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/nufunirudurinewovuvubo.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10860 bytes
SHA-256: d5562f6f05d4360fbff384c1c3d0d9341d47ed92ae5f222077dd37f52bbbbce7
font_02_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 18736 bytes
SHA-256: c6fce1c0ed2eeef4705f96ac6c38d01a4abfa422b5546901dfa397e9b59c14e8

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