Malicious PDF — malware analysis report

Static analysis result for SHA-256 08af866dcb434858…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 04:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85e8fa94cec251658123b02ebe0673d3 SHA-1: 2e0d8a7a013f3bb13f98b8333d86fcdbbc4f74ab SHA-256: 08af866dcb4348583fd3d7fb4d177a66890c14b357834fa236d1c1c17c42ae01
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, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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://cbstav.cz/file/83272910451.pdf In PDF document text
    • https://kuraniterbiye.com/resimler/files/rogudemuxepilenu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/ximases.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/87480627480.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/xijadelexirowe.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/kegijinojimenefodukuxawu.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94896681410.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/92687918430.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/jesasowule.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/61730486323.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jerakulifajemaruriwosu.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/82088358731.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/16957040482.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/sevajevelip.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/depijegagegidev.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/77903654154.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sedexiso.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/zunidujulitakus.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/55689040196.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/124e7050fc74dab8177ffdf8cd538731/43450924621.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/pivibubiwisonu.pdfIn PDF document text
    • http://budropol.de/Upload/file/8390282483.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/xedowupum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chaman+bahaar+watch+onlinePDF 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_off0000aeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 14696 bytes
SHA-256: f00ec9bb19382f75a7d78de21d93341dd89be58fbf3843d125dab1561fb52aad
font_02_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10584 bytes
SHA-256: 734e1468a01aedf3af983420ae8c75fa8cf6c0578d6125960bb77236b7f8ae3b

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