Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fc099a41a71d7b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 08:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd2279cd3e148cdad6e99efe8244e722 SHA-1: 854aa84ed1cbfa83557659f085987abfa6ec4caa SHA-256: a4fc099a41a71d7bc142808ceb5894ae44e3d02e21d5a0f5d2478240ca780841
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a high-risk heuristic indicating a lure to install or connect with a remote support tool. The embedded URL points to a domain that appears to be part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://bologen.ru/wix?keyword=windows+netstat+listening+ports+filter
    • http://starkrobotics.org/in_christ_alone_brian_littrell_piano_sheet_music212a2.pdf
    • http://formblckr1.xyz/semafotuwutivaiq96n.pdf
    • http://top-odejda.com/how_to_play_mind_games_with_a_gemini_manysqb7.pdf
    • http://vazutiz.iblogger.org/mixture_and_alligation_problems.pdf
    • http://sallles.ru/84318596046n2ugs.pdf
    • http://thelait.pro/1107486096lr8m8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://roxoretubobo.rf.gd/ketafa.pdf
    • http://zulexesovo.epizy.com/powered_by_android_tv.pdf
    • http://papetamunamu.epizy.com/nowosuvejigulopilonex.pdf
    • http://mapelapelebiben.rf.gd/what_is_benefit_of_hypophyseal_portal_system.pdf
    • http://nesaketesimifu.rf.gd/rizojurixojusovusigak.pdf
    • https://uploads.strikinglycdn.com/files/9e22dc04-f783-412a-8ec6-4c64449ce668/what_is_an_ivr_pin_presto_card.pdf
    • https://uploads.strikinglycdn.com/files/7cf03b73-0de2-491b-9963-07a605c443e2/8723499402.pdf
    • https://uploads.strikinglycdn.com/files/93f9ab55-f0ce-41ab-87af-d491b4bf1d13/which_is_the_best_book_for_python_beginners.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_05953c8bbbd54f179b6da171356a7a7d.pdf?index=true
    • http://wogalukufizoma.epizy.com/godowsky_java_suite_sheet_music.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_c119ea2a3f2c4aca8e61a4cd93f48252.pdf?index=true
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_96c608c90b014127adbac80d3cea63a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c1b1fd2-1e4e-4e50-b296-b8ef13340811/99239778492.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61d.bin
f4f7504845472c83b85f42b250cabc9218c1027440431360ae97bd85592647da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 5312 bytes
font_01_sfnt_off00010857.bin
6daa9ccde26df54c8b156d3083967e66b91a635a6726c0e84b891ef5f3937ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 12436 bytes

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