Malicious PDF — malware analysis report

Static analysis result for SHA-256 531b2560be4171a0…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 07:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2ddf80bb948d34f711dfa8b64335c3e1 SHA-1: 292ddc85476eebd993ab3151d21337927b89862a SHA-256: 531b2560be4171a02bb72675ae695be3953ba0e583f48bd94bc19b1d7bf654d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to car rental pricing, consistent with a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=how+much+do+enterprise+charge+to+rent+a+car PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/t8hgIid/vowaxapenevejafa.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/9gdieSU/20272109000.pdfIn PDF document text
    • http://zubiki.top/why_is_my_drag_saying_check_atomizerbdu0f.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/mezutl91ll.pdfIn PDF document text
    • http://gugibugud.mygamesonline.org/23377956527.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/lobowu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/KmYgjMj/60861563968.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/xRifgcS/crash_team_racing_pc_emulator.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/array_concept_in_c_language.pdfIn PDF document text
    • http://esagafow.fun/legudigubevin1rk0.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
    • https://s3.amazonaws.com/vekodupiwarobi/maytag_2000_series_washer_reset_button.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vomininudozuxekes.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/blouse_back_neck_designs_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/formatting_works_cited_page_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5189caac-b858-48b1-9517-132c241be3f2/58683641664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89b95d1-0890-4219-b496-f954597e63b9/vegidufusidedukufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2afc866-4c2f-40ca-b49c-a89de81e39c4/tipaluzajofetezix.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/kilukareregopidifapulixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/stay_at_home_jobs_for_former_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/78780802969.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/wheres_my_refund_2015.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5388 bytes
SHA-256: e088843cd12792d87e95f829b408f431df3f9a684b0be6ecf9653bd75227169c
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 11068 bytes
SHA-256: 5a54f88699698e01e8586637bc1f32438a4e95f554983ea3a0db797b8f624993
font_02_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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