Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80fb3c610583aa0…

MALICIOUS

PDF

99.5 KB Created: 2021-03-04 01:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4ec92e3fd1e7b3f447153cbb7e621b SHA-1: d89e8c2cde9d69e9d96012ac88333364b7a6de77 SHA-256: f80fb3c610583aa0b2497ebe9acdcb56e1890b5762e7271a1ffaf42f121e02e2
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 employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for malware delivery. The embedded URL, https://nipisod.ru/123?utm_term=default+password+for+xerox+workcentre+5955, is likely part of this malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://nipisod.ru/123?utm_term=default+password+for+xerox+workcentre+5955
    • https://cdn-cms.f-static.net/uploads/4465151/normal_60400a70c938d.pdf
    • https://cdn.sqhk.co/xekejegixawo/crRuojc/infected_cut_on_leg_pictures.pdf
    • http://reduslim-buy.site/ricoh_bay8controller_hp_elitebook_8440p_driverkzr90.pdf
    • http://20970907.net/badla_movie_telegram6uhrn.pdf
    • https://cdn.sqhk.co/zubavagi/gjSXohb/doruwago.pdf
    • http://mignonette.space/romezukajaretesifsrij.pdf
    • http://bigswinner.space/563118999304t4yd.pdf
    • https://cdn-cms.f-static.net/uploads/4408355/normal_60280ba7e324f.pdf
    • https://cdn-cms.f-static.net/uploads/4479679/normal_602f2edf193e4.pdf
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/wumomevoteziw-wupuxofabama.pdf
    • https://cdn.sqhk.co/jotepomi/mWaJChe/wixakixomimogemivu.pdf
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6033fc6ba55b7.pdf
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/furubuzifiz_toxarazevox_polujabos_kesobumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifedefujodu/how_to_pair_hearing_aid_to_iphone.pdf
    • https://s3.amazonaws.com/rumezo/mathematical_physics_h_k_dass.pdf
    • https://s3.amazonaws.com/faduxodiwo/brilliant_answers_to_tough_interview_questions.pdf
    • https://s3.amazonaws.com/fajetufekejo/96080921291.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_off00014870.bin
c4116bfe08520d0d470f432632124762c6debff7d4c43244c1bc4f92d9a3baba
pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 5652 bytes
font_01_sfnt_off00015bdc.bin
31eda08ffa413a0ddb6a54eabbe62bd2f8b51ab87d316df89a8cab18969569c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDC 10756 bytes