Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3976932a31f6f7…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d75f408c5ab24187073ce0a3133689aa SHA-1: 2bcf2810eb3e8ea829c858862cc3aca6ae9bb7a5 SHA-256: 8f3976932a31f6f762010922e96b7f2c720720d3ccd061775ea16d2407da3bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

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://garglob.ru/uplcv?utm_term=fifty+shades+darker+through+christian%27s+eyes+pdf+free+download PDF link annotation
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/sanoxuraban.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd5024d4a7---31779858468.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/86053196076.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/lusose.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zalatofuleja.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wedibizipan.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/98130879505.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/29838081687.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94491418275.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/37195030798.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazilumubigofufu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/tarekuruf.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/25617011269.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/3469338064.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/53122875346.pdfIn PDF document text
    • https://negaratoto.com/contents/files/xisutop.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13274466801.pdfIn PDF document text
    • http://dgkno.cn/upload/73367256857.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109131724562761.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/33662414093.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf042a552---4005926955.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/narevob.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/26611238229.pdfIn PDF document text
    • http://zaiger.ru/img/file/95869370462.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 18632 bytes
SHA-256: 80ee563a64be12c64ca070ceb722145871f745ade142b49ffcc021e8ee58885f
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 11300 bytes
SHA-256: a2ad749b4037e176d3a0cee9c7ba9aacafb0b131e219f28aa5c1dbbbdb22be88
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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