Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6ce8c4cb212497…

MALICIOUS

PDF

93.7 KB Created: 2021-09-15 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06be3895ba0bc3719c525d912b92ec9f SHA-1: bb2e8a762785fd5300ab36c5408c63349d629f25 SHA-256: dd6ce8c4cb212497021f3774ca8bc8951df72af1e1601342f8ccd4beeeb50123
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a large number of external URLs, many on disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=light+platinum+randomizer PDF link annotation
    • http://bacsionline.net/userfiles/file/27962552635.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210909225249.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/vexapajo.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/10251344731.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/44955583682.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59365213926.pdfIn PDF document text
    • http://creationart.hu/files/file/55566536867.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/67110906981.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/moxepubufawemojube.pdfIn PDF document text
    • https://telorgabus.com/contents/files/542129010.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/labasopodul.pdfIn PDF document text
    • http://techbis.pl/files/file/11843345654.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/piwukuwuxidufo.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bipumexam.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131596c7fc88---felemiwusobud.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wozavazilujib.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/37805684752.pdfIn PDF document text
    • http://gr-chem.com/upload/files/sebulibadas.pdfIn PDF document text
    • http://www.heksan.com.pl/file/17472215057.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/merejusosokebovuzap.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/70807768418.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/86852735473.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/gasujufipipugof.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/70533238543.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_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 10788 bytes
SHA-256: 3c893b81e5660242a745367da740f39d81e25b9000f82e880395fb491dcf199e
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 19180 bytes
SHA-256: 7bbdd968943519de5b8f9a378e952e030f102e5ac3448515d3a10d3b3759d0ca

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