Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f276c0f16f1090…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 18:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f2634791d2ba7c11fe8ab70cf2088b8 SHA-1: 5feefbb15c3711939b7f6987810810670165b761 SHA-256: f0f276c0f16f10904d4dc84cb8917f503e7e04091330186c3c2d47c00d33feba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, many pointing to disposable domains, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

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://broadcasthub.com/ci/userfiles/files/4779419585.pdf In PDF document text
    • http://studiolorenzino.eu/userfiles/files/tolapuzosazowopitix.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/86573984976.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/97573737810.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/95660792872.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/88411405991.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/guvoz.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/51744287002.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/64080018085.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/58984433899.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/85311275917.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/raxurawosalogaxumawawof.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3484228615.pdfIn PDF document text
    • http://zaiger.ru/img/file/fekemutubepebuze.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/es25kruc4av66g8a63v7h83isg/85009133232.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/94634824325.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/87891935212.pdfIn PDF document text
    • http://online-cycling.com/files/file/91424028708.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vedukenivavigili.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/53567743276.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/31359035532.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/ravodajetowimuzugadat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=startup+movie+eng+subPDF link annotation
    • 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_off0000acba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBA 15924 bytes
SHA-256: bbc95526fc26da61be7d8546f293c33ab85bbdb3e55a14a269bd345e6d2956b9
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 10928 bytes
SHA-256: 6b272914226362b756b01479e96c044b4348e7cd8c975bb9e4355c1890eba029
font_02_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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