Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7f9f345dc98e94…

MALICIOUS

PDF

75.5 KB Created: 2021-02-22 00:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 437d3e53f2cc88063a53cf98cb922f55 SHA-1: 99e98150ae7dbac80e6527e8cb17f17f79b7df58 SHA-256: ec7f9f345dc98e9483c3ac3f133fa19476a2dd5df8005c306df30bf2ed50645a
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded URI pointing to 'jacksth.ru' suggests an attempt to redirect the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging social engineering to trick users into visiting the malicious link.

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://jacksth.ru/strik?utm_term=flowchart+template+excel+2016
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fe9f5ce0a08a.pdf
    • http://baxebeteziwetu.iblogger.org/xagijemep.pdf
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5fcd5135340fb.pdf
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/7870728.pdf
    • http://viriruxik.22web.org/look_down_les_miserables_sheet_music.pdf
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5fdd42d3468c9.pdf
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601916cbc74dd.pdf
    • https://dopeziporop.weebly.com/uploads/1/3/0/7/130739225/5604879.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_6032116a8127e.pdf
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe7ff3d80ad0.pdf
    • https://jutifakakunule.weebly.com/uploads/1/3/5/9/135985430/wotekedunese.pdf
    • https://cdn-cms.f-static.net/uploads/4378378/normal_601068ec29f77.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60206cc274b99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://powiwuroda.epizy.com/netgear_prosafe_jgs524pe_password.pdf
    • http://puxetedategekex.epizy.com/faded_piano_sheet_music_original.pdf
    • http://kodexogezetegir.epizy.com/medowopute.pdf
    • http://poravilotizeve.epizy.com/adobe_acrobat_reader_gratis_italiano.pdf
    • http://gufobipadu.epizy.com/weather_report_punjab_kapurthala_dhilwan.pdf
    • http://xevikosurozogin.rf.gd/formal_letter_for_visa_cancellation.pdf
    • http://lexojowal.epizy.com/answer_to_the_impossible_quiz_number_34.pdf
    • http://ludujefu.epizy.com/mac_os_catalina.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_off0000e9ba.bin
b0fcc505c3a017e6d04805606132518c267518c343ff55d33f7e58507637de2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 5588 bytes
font_01_sfnt_off0000fcb0.bin
2e54dab4b171b8d98cfde52ba7d4911fa56866623471d5cabc8a0edfcde6eb7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10496 bytes