Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f27245ff1a67f78…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 18:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2be10875a619131a20c6b09558a86a12 SHA-1: 93d655e45e5286192ce1315ff5048600b9f13153 SHA-256: 8f27245ff1a67f781b1e803a09fc46d500fe38746f6e3253cacd316935b46368
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=mini+crime+simulator+mod+apk PDF link annotation
    • https://gogreenonline.net/userfiles/image/fckeditor/file/89493719466.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/44565337427.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/zukosabof.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gimimolajamato.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xarabusobizabevifimu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/muzobi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/nusitizakufijiriti.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/97009062354.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/43062248176.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2635de2---34523023866.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nademekuxovugepeziwaras.pdfIn PDF document text
    • http://modern-pro.ru/files/file/99563363840.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/lemumudoredutejewakijab.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/genurivanatawadujasas.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gijixafusipami.pdfIn PDF document text
    • http://esen.life/userfiles/file/49602388753.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/59624286220.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/41760417961.pdfIn PDF document text
    • http://findusafranchise.com/files/files/kulezuzuripesodezofaw.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50278206897.pdfIn PDF document text
    • http://gekon.net/userfiles/file/33845742946.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/savadiwabipabozisobirus.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f0936f017a9a975f2928978ccda7ce1e/97985722429.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/kixirowoligitawumatu.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10860 bytes
SHA-256: 2203669e0403595e6d65346e91cec113951d4a1f9bd47ea70ed5aa0d74049d91
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 17456 bytes
SHA-256: 15ebccc9d436a710801249f26be6d043cff8861b72a63aef746278601ded0971
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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