Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3b7eafb2c5f3ad…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 00:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 125585d91ff6e866c1b0281d1989f9cf SHA-1: 4df14676591340b5a15edc3a05a9a36e0b718eca SHA-256: 8a3b7eafb2c5f3adda0a5058a1040c8c988a33d65605e015bafacde4928493d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://autowassenindex.nl/images/uploads/kubebamezorutuvubef.pdf In PDF document text
    • http://ambcavallon.eu/userfiles/files/pojarebisuduvozixonodigev.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/gozufudafagosepokofudatu.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/wusigeneperaxax.pdfIn PDF document text
    • https://ptogel1.com/contents/files/titejitanebidite.pdfIn PDF document text
    • https://onlinendttraining.com/files/54651094092.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mikixakuvagij.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409a19b381f---vupotujivapu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5433c900---desugokuduguvazofegafuwex.pdfIn PDF document text
    • http://drtamerturan.com/file/25318423217.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/vodunuxaxirolif.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/77103505159.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/zogadejakesaf.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/tefiwumopanabovenoner.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219817711129.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/62953335747.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/84372695072.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wofuwubivofigilip.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55934413753.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/23438182953.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/nonimalizovejiwuse.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/xulepexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=home+screen+pattern+lockPDF 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_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 10524 bytes
SHA-256: 2625ef3af7e2e2299c9b2e2851e334c9639a2b08996ab9e3f7ab35cc66596e7b
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 16572 bytes
SHA-256: 5b47e259094f4944101b99773c45fb9b3e09823de949404436029f34ea828678
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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