Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc456136ffdf58ec…

MALICIOUS

PDF

90.0 KB Created: 2021-10-07 22:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9c54eb273d788a07c15e9883b7c97c66 SHA-1: d62d1188c8b226a061f64275f2b676f674eff75e SHA-256: fc456136ffdf58ec03d4d1960c7a452d5cbfa3bd154b6638bf3631a1e78a2ea1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://speed-r.com/js/upload/files/61699296830.pdf In PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/bogasowopadojisosamoxuj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vewebojekasar.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/xaxogemurekizubizegi.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jederelug.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20211004015925_551436.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/78361931891.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/momovurazumilumij.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ligikerowuxal.pdfIn PDF document text
    • http://belst.by/upload/file/samitajavekelosasinawu.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/57357188083.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/40699281388.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/dafuxidakafedubixupo.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/jubuzefivo.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/79135419439.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/80470315526.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/zodalisetofusa.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51255792700.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/44296330792.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109230757009220.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/72083707281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=funny+quotes+for+college+friendsPDF 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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 20508 bytes
SHA-256: 6d375c03e422afe202728f3b05b634204fbffb1e5520f9e71df6cd86a56f2908
font_01_sfnt_off00012a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 10828 bytes
SHA-256: 1e580f122dd4278631071651e1e850722b0faceccd4f44e5cd533ac2bb007a02
font_02_sfnt_off000142a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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