Malicious PDF — malware analysis report

Static analysis result for SHA-256 79703ad84c2ddd0b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-25 17:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a62fd3544ea5dc091bfced2fb5fb67cb SHA-1: 9b5df94d691a3dec9a71600f766a6bcd37bea0b9 SHA-256: 79703ad84c2ddd0b9f52b0e38b9bf37b74d580551500e93a1b5c3abcb8217db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=icd+10+2021+pdf PDF link annotation
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/digup.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/22851563063.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/7219806947.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/39221707080.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e29dd082---jupovejivemoxati.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/50946957693.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/popevivekemudov.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/74049251369.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zarifasavokixorofipomom.pdfIn PDF document text
    • https://fivetc.net/uploads/files/17799064326.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vasawevowiwodizedosaza.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/rewininofa.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907151641.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/72893948275.pdfIn PDF document text
    • http://esipro.be/userfiles/file/nilurewo.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/45271070246.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sojakipolarun.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c07401cf5---92994329847.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/71988357860.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wurarub.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/wipex.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_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 9836 bytes
SHA-256: b51b265a35877a54053f937912ffc533235d22a83b036e469debb795e44d233a
font_01_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 19716 bytes
SHA-256: fb4dd7006188026e5886d6faf7cf830de589fc1925fffa3fa5149ee7ab3fdeeb
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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