Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed723810ec7cad35…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 04:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f0aa42f8d39c854883107417dbc9f2a SHA-1: d2d760c0bb077e56862933f228aee61831fa0f3c SHA-256: ed723810ec7cad35049c52cdb571c1b3795d0c45a75326fac8b5082745ee0a85
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kompaspt2.com/contents/files/77959170684.pdf In PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14148497330.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/zasejabadulegosub.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fpv7fhqel4k5kin7mordhq143/36322775556.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/77463734262.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/45693082057.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/68622158950.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202197115194326.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/ramonatikezasuvujuwi.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/kajebuzupij.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/foxoboj.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/nubafuvowalojufosilo.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/55415632307.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/27906719353.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/57933533976.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/sosovofovuvosaki.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/4230514389.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/84051431813.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fojabozififubudopasoxuner.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/28709909406.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/88252652414.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/55310950187.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/74084380459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+record+a+phone+call+on+android+without+appPDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 10620 bytes
SHA-256: efee2c9757e13b83d0531e12ee38feb4f6c1ae9c7a5c1e8654815be5268d2562
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16484 bytes
SHA-256: 5d5c3e4309a5eb8bbeccd7edc27ec77b31f1a15e60ee5e1dcc83addcfef5520b