Malicious PDF — malware analysis report

Static analysis result for SHA-256 c672d7818d431b29…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25be20ef8b8e3694fb7a1412bceab564 SHA-1: bf96844b427ca12efb8d59afd7adbc72113bdce8 SHA-256: c672d7818d431b293fbc8e6ebc46d7e09525b0177bc38a4220ea553415b72df4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs points to a potential download or redirection mechanism.

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 http://studiocinti.eu/userfiles/files/guxovuzuxazedefilupo.pdf In PDF document text
    • https://ijpdua.com/contents/files/39772504720.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/71046624620.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/64673279594.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/63108061384.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/46471340047.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/18975668117.pdfIn PDF document text
    • https://betsin.org/userfiles/files/89380324283.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/97522705341.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/12871474366.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/4607372757.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/70469584622.pdfIn PDF document text
    • http://szjg.hu/images/file/68833248253.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/32846789317.pdfIn PDF document text
    • http://chayka-svg.ru/files/78465568861.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/supexasanimowam.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/25568973283.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/nilopipixoli.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/38310358645.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130e57d38f79---82549273404.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/17798055995.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/75993629196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fnaf+sister+location+game+onlinePDF 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_off0000ba89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 10656 bytes
SHA-256: 4b8bc6de9018bc63c06a438a3ed92beb5d47c3a3ffb68a5592ac52589295b737
font_01_sfnt_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16408 bytes
SHA-256: 6ad5c600873121e5e700f6854a230c9b4de162a0815a8547f939f20505bdb692

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