Malicious PDF — malware analysis report

Static analysis result for SHA-256 837b0e0e416b218c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-25 12:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 216fb6a5a8c8fc9f81c6af3638eee91e SHA-1: edc1f9cdc9cbbf65cd3845ddd83bb746034c6274 SHA-256: 837b0e0e416b218cc5cf2a1c9a86078472479e0df8f213dbdd638d50d4fb3c34
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 heuristic indicating a remote support tool lure, suggesting the document's content aims to trick the user into installing or running such software. The embedded URL points to a suspicious domain, likely hosting a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://baarspo.ru/123?utm_term=samsung+clp+365w+transfer+belt+reset PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5ff7c9801dcee.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/hi3jbjd/letuwadudur.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/Rvicmjj/toddler_words_starting_with_e.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/iiVjejf/41207665872.pdfIn PDF document text
    • https://cdn.sqhk.co/paxelababeg/ihicgeq/tutajexemagawekere.pdfIn PDF document text
    • http://aydym.club/43262637344alzqb.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/zaloganirinenivebanarow.pdfIn PDF document text
    • http://canonsburglake.com/38274547691mngm6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukefomirufiza.rf.gd/b_e_c_ki_full_form.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 6112 bytes
SHA-256: 008d4712e5efd5b64483a8b4098bbe1fba4719e86d6a42e3b091bb8cc844f600
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 11292 bytes
SHA-256: 7b0483149c664ff82b6cd9860ac78f7d5e8e28a0610c862d7a27957e449c302e

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