Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf9220ffcc4f7cd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 12:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23c1f7b0b198e13f0772a7c1153af143 SHA-1: c8096e499867d30f89c2f9824ee31113c177f307 SHA-256: ddf9220ffcc4f7cdc4dee406376e529a0852317753061891c044405b88f097a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://irlanc.ru/uplcv?utm_term=friends+2+season+1+episode PDF link annotation
    • http://smogy.ru/files/files/8988349201.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/2103696427.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eaff06b7---94534291157.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///29441986955.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/88498765367.pdfIn PDF document text
    • https://efnnma.org/files/file/16424187965.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/wexusinokexulux.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zulejegi.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/51235584224.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/wowikikigijikexesuzogen.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210907_004439.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gejuna.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/julekeziripokorusibi.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/72762968980.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/83633440682.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/vakunajepifaxaruminififap.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/robaruvogilalinagovu.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/suxesoduvonawimasiwalu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/55736605064.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/27501906418.pdfIn PDF document text
    • http://boldogelet.hu/media/dusagorezajanus.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/76476258137.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/makenajalesixaj.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/20411602881.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6b7d26deca1488c1cc3e7b8e6b2a6228/54303195299.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210904_142318.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/17159897689.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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10392 bytes
SHA-256: 03696749d10ac7b6a278e267505d8eb0db9ac17e7ed432627b888702a8300c73
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 17344 bytes
SHA-256: 6afe2a6fd5ba7201242a7a4b04dd8c80bff2b4be15d5f6fb98ac0d79c99b98b6
font_02_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1