Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be2673f8fb06836…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 16:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7afef52ee6e70e129fae9c6472f2d6c9 SHA-1: fafed843446072b0419fa10255b2baf0b6473126 SHA-256: 8be2673f8fb0683637686b84da821c7188e3b12a7f05abf8d01e828a61e5c46b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=mortal+kombat+in+theatres+near+me PDF link annotation
    • http://baovethanglongmb.com/upload/files/16885066802.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341deee0489---dugufutarexadujukasilufog.pdfIn PDF document text
    • https://soechi.com/userfiles/file/2312844504.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/folonajawugexivegeb.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/takesemokutu.pdfIn PDF document text
    • http://metall-press.ru/files/ritijixisoluzilawobitom.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/datugabubola.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210831_191803.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090206022673499.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/74562512688.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/83841113383.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bexijepilezokep.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/bafip.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/womexupetuwobesapamofop.pdfIn PDF document text
    • https://jotelek.hu/files/file/mologivepajer.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/74465177884.pdfIn PDF document text
    • http://shamayachts.com/upload/file/mexanije.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/42402779511.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/tawunubiwef.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/veriw.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/todakipaxovesazubar.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zukaxisev.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905033506.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_off0000c1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F9 10600 bytes
SHA-256: 1c609f2f016be2cffae0fa2a8d20762f9734d1e361bf54a2ce7eeb127168d79b
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16468 bytes
SHA-256: b823e7ec7876bbd6599e7a403b9b0a1d40a1f7d11051043b8adcded6c09b4fd2
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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