Malicious PDF — malware analysis report

Static analysis result for SHA-256 943b105f6c7702ff…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 08:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 306252249ff80154a54e4edfa0ddfd3a SHA-1: a166d687b246d23dada09dc1a0f9d1087a334f13 SHA-256: 943b105f6c7702ff4358c2b7bf7be6e2e58f0ac2c4770eaf80c2b709665eddc0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lensprovn.com/ckfinder/userfiles/files/98570504885.pdf In PDF document text
    • http://bezpiecznamlodosc.org/files/file/busexeguvisegamuvejodo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/23843576815.pdfIn PDF document text
    • http://balone.net/_upload/file///5341568592.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/diruzeraruj.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109201309446561.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/99130127815.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fumiroripaxivimunebovike.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/5259812344.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/30972924162.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/gemiseli.pdfIn PDF document text
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/tedajimagob.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329b6994bdd---resurew.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/linijazok.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410805c11ef---fopofoxenazopino.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/jolarukuzufasuvas.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/49223862616.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/doluposavelabo.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/wovaxasulupison.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rizizatenujagatez.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_256FF8042B80C654.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/74307017329.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/54250467107.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/23713875140.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/92483934558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+android+data+recovery+softwarePDF 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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 16936 bytes
SHA-256: a3d1320572e9dcd280a5d2bdbaa108895df7f28f6e96423912ddf00cc062a35e
font_02_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10736 bytes
SHA-256: 023857490b5fe91dc56bc3b0bf96d1208bab3de813ecc4d4577df61332b6265e