Malicious PDF — malware analysis report

Static analysis result for SHA-256 a141ef768ff21156…

MALICIOUS

PDF

83.8 KB Created: 2021-02-25 05:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be17ca848406061ba7a81c92c8ee2499 SHA-1: 1149619b3ac17396b4d7d42a82c4d474e7f6a96a SHA-256: a141ef768ff2115643400a34a28b98df4ff1375ea492f76190ed8dc1582e11da
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file is flagged as malicious by multiple engines, including a critical ClamAV detection and an ML classifier. It contains a link to a known malicious redirector, https://crophysi.ru/award?keyword=maytag+quiet+series+100+dishwasher+racks, and instructs the user to disable security software, indicating a phishing or social engineering attempt. The document body is heavily obfuscated, but the presence of a malicious URL and the security bypass heuristic strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crophysi.ru/award?keyword=maytag+quiet+series+100+dishwasher+racks In PDF document text
    • http://zememor.sportsontheweb.net/new_yorker_student_subscription_tote.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/njJichj/pro_football_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/jiu7QWO/how_to_use_quick_repost_app.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/molukojekababam.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/jiIThe9/best_non_catalytic_wood_stove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xolavozezimodan.onlinewebshop.net/wizards_of_the_coast_entry_level_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/vunujapomades.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/jenegepevasebazabepi.pdfIn PDF document text
    • http://tuzipegubeluwo.epizy.com/esthetician_table_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/silokuxuvuforonirogokom.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/28248320310.pdfIn PDF document text
    • http://pewazeje.rf.gd/ldc_answer_key_19_august_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/95244858362.pdfIn PDF document text
    • http://xaramoturowuf.rf.gd/zusifimasi.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/51888712215.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/27052659915.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/39981717969.pdfIn PDF document text
    • http://gonulurejojele.epizy.com/28493781452.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 5420 bytes
SHA-256: f3cc2a6e3ab955ee0d0e51edfb4a435e30be2bb0a37f12546e3009ccabd40b85
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 11272 bytes
SHA-256: 832faf6de5997d9b4e2002f3aa8b0b8560031e45f373e0231163bccfb816921b
font_02_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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