Malicious PDF — malware analysis report

Static analysis result for SHA-256 da427c08d34e8da3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-27 13:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 001758b161f0862e30827fbf0a226702 SHA-1: a6b5ed8ca8ec935085137714364ce36e91286e4b SHA-256: da427c08d34e8da3ef951550c28c52af95f6fc07c518acf0135cc640cd4399a0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a number. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to deceive users into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://beautydent.hu/editor_up/fiwurakorowipi.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/51043412126.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/gefusinabamamuxenada.pdfIn PDF document text
    • http://santeh.md/img/files/1399740816.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/vevasapenawo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71546398520.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0edcaee---11988694079.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cefc81994f---gafadu.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/2576334613.pdfIn PDF document text
    • http://hmed.vn/upload/files/jukonemolosow.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/86285945566.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/wijekonodokilosafubonulig.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/50279130319.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161857511863.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/19849724322.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/11988270121.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/1017401392.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210920_7E536740C54F0271.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/42702297722.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/ririlijeseke.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kemivijija.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dotafamamuzolopu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/kulivavonixuteme.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29657260897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+gesture+lock+screenPDF 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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 10556 bytes
SHA-256: 52f830aedd54d33023a5a4d05c75ab3a723c8c03ff5aec697ce7e1a320f426d2
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 17880 bytes
SHA-256: 7f7aa917b32ccc54fa3df0812e5ea96d35497c853633823ce5f0b37a27757b38