Malicious PDF — malware analysis report

Static analysis result for SHA-256 db40ad17de5d8f48…

MALICIOUS

PDF

85.8 KB Created: 2021-10-14 02:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6b9c724b8c9fd07abc5a167f612c2b19 SHA-1: c7941586e68c15cf3c747250ec77ace943df127b SHA-256: db40ad17de5d8f48ed00c1721f5d84514ff33e7bcd1f2eb1f690da00006017ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially malicious sites. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://olboihorgaszto.hu/editor_up2/93015088438.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/nomafipipi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b3a2faa937abdfa62d63576a154a2121/1966216487.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/15104173209.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613e98b5d0---zotanujer.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79243130001.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/duvufejuwiv.pdfIn PDF document text
    • http://fygl.net/uploads/file/092229134342.pdfIn PDF document text
    • http://alidongdong.coco1490.com/upload/file_folder/file/48260022081.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/88477422643.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/vijefitabukejitowozowan.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/78897796528.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/gomekalile.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/95095641186.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/kepefubafedonifinidol.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fonagobokivu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/212147072.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/28087420887.pdfIn PDF document text
    • https://kar360.com/resimler/files/mimovoveba.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/95357671323.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bifetiviwiw.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/84801148146.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=a+dilute+solution+of+h2so4+with+platinum+electrodesPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 20116 bytes
SHA-256: b0ac3a812b7167ccaa72a75b1e12aa7ab0dbded6184adba7445da924ef577ad8
font_02_sfnt_off00012ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 11252 bytes
SHA-256: 18db93ae2f41b3f878142370e5cd3fbdf3a2c103531f710babd36bf587c2f5e7

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