Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27d71a857f4eb0c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 20:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19c5e019a8dbbc79f7c5eda289c645f3 SHA-1: 862cf75b25a762a5f77785a2841f269f8a648168 SHA-256: f27d71a857f4eb0cba44ea689da696205dc5f13da88022d0bab30f05ca4a5549
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a billing or security context. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or trick users into executing a malicious payload, consistent with a phishing or tech-support scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://zhuoxinlaw.com/userfiles/file/20210906171032_1446183763.pdf In PDF document text
    • http://cluboutletmoto.net/campannas/file/16088097423.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/32978756076.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/57456808616.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30397956650.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/rupekapi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/todekuresol.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/xuvepapifado.pdfIn PDF document text
    • https://seikai.jp/free_images/files/jufesuwovefunuxar.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • http://e-sheremet.com/img/26424915724.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/31983758844.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/98111780676.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/gusogolukigexol.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/5787023340.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343164272a7---lunexoxebozonevug.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/49122122035bd2d831a3b043a4a3d9f8/30085402850.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/zuvejoborul.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/govigipaz.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/81595885166.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/77231528651.pdfIn PDF document text
    • https://luminex.pl/upload/file/zawudotisot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=narnia+the+magician%27s+nephew+pdfPDF 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_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 10996 bytes
SHA-256: 034fbf4e1e9fc934d399e6cbc711dbc99783449f8f77f017d1a995af3fda5c84
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 17396 bytes
SHA-256: c286764072eafb730247de35d676afdc8774ea415be14538a909c1502be049f0