Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc106b35c05d804f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 21:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 591fefe0b2273dd4ac5b3e4473534bdf SHA-1: 11d3da73f68df52524e54fa4c1f18a7bcdbc0ce3 SHA-256: dc106b35c05d804fbcea598ead984ddb5eea714f4962359d7b0cd4eec8a86cdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm, a common tactic for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ukmalayalamnews.com/userfiles/file/64133236367.pdf In PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/86588508561.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109031309471739.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/zovipava.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/93171469207.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/86576295676.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/6058843040.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/32693484040.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/99126109372.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf8017636---30268286320.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gelowidedi.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/tatomuwewazuremurirerig.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/14933373385.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902180531.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/salajabajepexapomemi.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/movoxanidesu.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zafaduxokisibudunulami.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/71149164119.pdfIn PDF document text
    • https://polytex.de/sites/default/files/75029492136.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/47587273909.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/1664479483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=droid4x+download+for+pc+windows+7+32+bitPDF 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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 16840 bytes
SHA-256: b4c7657fc72ac0e833a0602b4806aa327157fd27de9d5c426533046462763288
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 11232 bytes
SHA-256: 9fcdb5222fa3bce226e6a5d75559fbd5e3e43e796d131a56766544086739e602

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