Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3badbdc953562…

MALICIOUS

PDF

67.5 KB Created: 2021-09-13 05:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30c3880bdf710affdb213d22c969a199 SHA-1: 9e0937293ecf688bb2a493b37c63df893552f195 SHA-256: 0ef3badbdc953562bd6eacf73345b48f3fd621d43d2c48b169d4d1a34a45868a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF acts as a link farm, directing users to multiple disposable hosts, with one prominent URL being https://inwebjor.ru/uplcv. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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=ludo+club+free+download PDF link annotation
    • http://a-swiss.com/upload/userfiles/file/xatewewudubeki.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/rukatazu.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/29129806713.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/30381905617.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/bisipijabuziwelubese.pdfIn PDF document text
    • https://grancom.by/upload/docs/tibiraruxuxarom.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/68881836597.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/75538083160.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sakitewotelelopedusivinu.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sumilu.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/linubarubefifunom.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/40212580186.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/rudozevimagedofoxigi.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/95345557973.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7efc59811---gezakofetivugevepa.pdfIn PDF document text
    • http://unityproductions.com/upload/files/ketumevepexabanilo.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/lijafufutiluvaruxaje.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5807309a3---34636457686.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gitefedavuvi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ea46f724---48290484505.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/xunewamonolale.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_off0000acd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD9 10392 bytes
SHA-256: f5dbda9095688799be953dccfb392db83542868347ff4be087bd04243d728100
font_01_sfnt_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 14448 bytes
SHA-256: 6a235397fd6631fc5ee52541b3dea3fbf53ae566cf50d697a95693606d00e6bf
font_02_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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