Malicious PDF — malware analysis report

Static analysis result for SHA-256 665fff877e19f85c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 21:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35fd159b8d596bacf2f64e6d5b576bb5 SHA-1: 5e4540ebbff9e477dd21ac7143dd0b5ed9807a22 SHA-256: 665fff877e19f85c7fb6c66986de94a3956c9480b63acef45da049172b4d4a39
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 URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or content-luring scheme. The PDF structure itself does not contain readable content, but the presence of external links points towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=can+you+get+play+store+on+iphone PDF link annotation
    • http://graphicyazd.com/ckfinder/userfiles/files/pejifukodedikuzolo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/93547278871.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/guxolidemomaxag.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/ganomatitukimarajox.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kelifubutazig.pdfIn PDF document text
    • http://tano-cable.com/d/files/15520473326.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/sutigavad.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/jodafase.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161344d6da45e0---42205079950.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/16703427305.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/92654730120.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jesodepiridiwisatemat.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/gepimegojex.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/puzuvagadagusebikilodubu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad57b2b602---safebiwowura.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/46079675189.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/86793287713.pdfIn PDF document text
    • http://vaithun.net/upload/files/dogaten.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/povonoz.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/wuxoxadabili.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/98899887588.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/50284378646.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetotawavagizuxibina.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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16936 bytes
SHA-256: b91648a1166cecbb1181aee1b813cd4fb8920bafa9b8715619a5078e56b569c0
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 10776 bytes
SHA-256: 7004ffa92fffb44b94b4379bb381a1ec412b2b20669d93c2982c4e681eefc7d0

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