Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc78b65e709cbae9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 20:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f55bd83f2c5017ffd6215f2482424b40 SHA-1: a5f0bfc50cc2f9deb2adc3943ed2e829432cfd6f SHA-256: fc78b65e709cbae973ee7c77c4f9a47b5bb97a1620548e08cd2ed8d0b1884473
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=batman+the+dark+knight+rises+game+for+android PDF link annotation
    • http://aliguoriarchitetto.eu/userfiles/files/kipoxaraju.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/liwalogojikejexirilu.pdfIn PDF document text
    • http://tcihk.com/userfiles/98183494105.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210909/file/zebasemogesiz.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/3917318869.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bapar.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e552eb9fd8---bugeli.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/64608051157.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/45573677021.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/lasapasagamus.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/4979591921.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/59657247289.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pogujasenedovikur.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906174328186507.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/20372692210.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/zaximuzalewufutebokox.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/bugex.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/87369766686.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ragupopexivi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ebd0b4561---94284076406.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rikalelilive.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kobusosulis.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/zokitisodezeti.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/54773609817.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 21704 bytes
SHA-256: b64d30cae04d46e74490d58924ddc2555f05a418d94482e0b284e72e3d83b4e3
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 10900 bytes
SHA-256: 08c84a9c190655e9c1b9d50061cba03a5a69e57a35fa15ef48636caa3b2653b3
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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