Malicious PDF — malware analysis report

Static analysis result for SHA-256 023d4b13f65e45df…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 14:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dd63302cf5d9c921af67c047ef836e9 SHA-1: c88f4f7e699e6f0c062a4d2540e508a916f6b635 SHA-256: 023d4b13f65e45df35456181c641dd87e8d97afe75203c8a2886ccd6a8dce99b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. 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 0.9953

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://rspon.pl/images/wyswig_images/file/15436139594.pdf In PDF document text
    • http://niktid.ru/userfiles/file/39821224710.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/wibosufeb.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/31407910303.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/aomcn5sisvds59erb14lqs0ls6/fixuxuwes.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/silolijokig.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/7004274600.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/91265802770.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/61453294637.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gesopenigig.pdfIn PDF document text
    • https://ms2oke.com/contents/files/dajezizazetosop.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/57339713935.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/22345622602.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/52533076378.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/17656946664.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/65879289753.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/28979785843.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/peruzob.pdfIn PDF document text
    • http://liluby.com/upload/file/39409090719.pdfIn PDF document text
    • http://kodemari.info/data/files/bokurimorurebepob.pdfIn PDF document text
    • http://finchamauto.com/pics/ziguzusetiwagoka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24a8825d7---wolegojatadasufusiw.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/guredeg.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vetawere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=incognito+tab+on+androidPDF 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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 10288 bytes
SHA-256: 64b2e131e6a89ae01cd2ba2084793fb675920e6138a6965d773dccad2d93a9e2
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 17588 bytes
SHA-256: 89d6adccaab1507887119ed2f2a260875a856727d6cb17dd6d641118824ca76f

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