Malicious PDF — malware analysis report

Static analysis result for SHA-256 54738fc69b9e8fde…

MALICIOUS

PDF

75.8 KB Created: 2021-03-07 04:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 9d76add267251ea325873c73acbc4210 SHA-1: 2032ef237c57a5524b579d9478d8323ced98e8a1 SHA-256: 54738fc69b9e8fdec182b1e728d51a0642a697f7ad0065f539cade285bf77154
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'wilderness first aid class maine' and 'wkhtmltopdf', which may be used as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soxebez.ru/aws?utm_term=wilderness+first+aid+class+maine PDF link annotation
    • http://zasasibibo.iblogger.org/breathtaking_meme_template.pdfIn PDF document text
    • http://pearhaidhr.fun/2005_hayabusa_service_manualiey1k.pdfIn PDF document text
    • http://silikidabog.22web.org/45510687778.pdfIn PDF document text
    • http://amst-watch-v2.club/fegasarofufagw91h.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/fimukulip.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/4234394.pdfIn PDF document text
    • http://dom-bita.org/what_does_abnormal_findings_meang9ktk.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/059327.pdfIn PDF document text
    • http://pink-echo.club/pufadurone6i4x.pdfIn PDF document text
    • http://guitar.su/navy_blue_jackets_manual_25th_editionvfsny.pdfIn PDF document text
    • http://poweludogijil.22web.org/android_firefox_console.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/wezaxuzodudowum8xiez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesubilav.epizy.com/solitary_reaper_questions_and_answers_ncert.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/quintessa_2015_tech_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092d0fec-8ded-4df7-be03-b97af4b1eb3e/jewununigebideragolupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01522bd9-59a0-4b12-a2ec-773f99e7822c/kigekefikufazavovadenuru.pdfIn PDF document text
    • http://bajokojukitipib.epizy.com/tipos_de_funciones_en_matematicas_discretas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115d536-3236-45e0-8d67-e34a70756102/sir_gawain_and_the_green_knight_part_3_and_4_summary.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5180 bytes
SHA-256: 763eb720ce759b211ee251af0a2dd6dac77f6a3f111d0fc58889dced0091f5a6
font_01_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 10936 bytes
SHA-256: 02a3812f4c2373b46504113edcb1787478983872e405a6828b4796ab5b1b4c42

Open this report in the interactive analyzer, or submit your own file for analysis.