Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b91f4dc0b68a63…

MALICIOUS

PDF

96.8 KB Created: 2021-09-09 15:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38c753dfa7adc627e58b4e2e3db8e531 SHA-1: 947e36dc9e939e0d5d3178ecd8d5fb95d80405b7 SHA-256: 35b91f4dc0b68a63c79864fab1afcda4f25dafa67b06013153d0968e189ae92e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdf In PDF document text
    • http://soundspace.eu/Upload/file/44987528152.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/femewafaluken.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/1112606850.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/dezubixitimizowug.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/45742598692.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161334603372e0---65901149555.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808d9859dc---suvirawujifubekokuni.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/69008118097.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/bikiwaw.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nuteworamijejiju.pdfIn PDF document text
    • http://yoron.net/up/files/47411506981.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/88955014515.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/dikezafuguduroto.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/lapipamimajoku.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/dudiruvuba.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/81575412904.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/94616456758.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/78427946172.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/79036200447.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/62624230753.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/23455436872.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/49848361674.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/65196985321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kurbaan+movie+oldPDF 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_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 10440 bytes
SHA-256: 451bd0f6dfe27fa31bfb1f8bf6e7f127f6d564a3a96fad4cedc50cabdeaac369
font_02_sfnt_off00014829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14829 17600 bytes
SHA-256: aedbf12e841773814c3e02512a890652864e82795a7963dd287f56ba46de3799