Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0fc6f5584a8b41…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 10:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f07425f36d997512ce4c9f3a23e6b16 SHA-1: 66b3f662170964a60b53a608f371a5bbfdf78833 SHA-256: da0fc6f5584a8b41119052e954b53737d254d73114ad5b7733a7d73a0007c2ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://designerhouse.ru/upload/files/pukoxejujanadolop.pdf In PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/48116126457.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bilitudurimobise.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/voxetonozibaf.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/72015065663.pdfIn PDF document text
    • http://dkind.net/userData/board/file/lixekepelixudafixikomu.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/jikenowivagigo.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/32775143671.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/20737205515.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/guwaverex.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/23369195841.pdfIn PDF document text
    • http://mayjack.com/upload/files/velosokewegukorevakajena.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/8869619382.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/93977565738.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210909080335450.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/83b8acd49710838cdf4c34ecb0aa0b25/51142398817.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wazazeku.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/7857398501.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/kusituzikunodeferuna.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109191048485133767jpc1ayk36jd.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/kajuwevo.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/nisosavarejej.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/75946693986.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lugomewaxidamiwevesusix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tv+box+remote+apkPDF 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_off0000bf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF77 10368 bytes
SHA-256: 532871b649eacd9187f281149c37670bab99cb1d8530d278335f6f1a5c36fac8
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 16508 bytes
SHA-256: 7b5c04b89545f7028a6da0b465da30a5c34a4e612fe93734ef7d4cef336ad561