Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ceafc63883a75…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 14:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 62f7dfc7edbccef1b244c4e6cf4b02fd SHA-1: cf4ea3763c222e19b2f2d28830a8ef49ab77372a SHA-256: 0f4ceafc63883a757390479babe0d658d229aaf7fa19dada3bd9a4077f491341
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://garglob.ru/uplcv?utm_term=famous+five+book+5+pdf PDF link annotation
    • http://vucert.vn/uploads/files/51578874990.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/besasono.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gabikete.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xolejagidagakugisiwakura.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/kadumiparafipenisep.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/wubisuraj.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/21916019417.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/35585633303.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44611854146.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/jenewujas.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kuxuzepuwerijipopag.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/soxasifunomesigufi.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/barazovesel.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/25132904646.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/98107564609.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/34093489026.pdfIn PDF document text
    • http://centrons.com/uploaded/file/72115002361318c2a2306b.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210909224153787349.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/wuzupexoxeno.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/lawojupidojew.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/tixamuzolivola.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_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 10820 bytes
SHA-256: 7681e2ebc9911b44dcc9b09ed22eac73335f63753ee12066ba328a042627e44b
font_01_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 17512 bytes
SHA-256: b8bc5b73c8ea037c43e0264e7e24c7304b94f79041b3fb501da26db473f89ba4
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.