Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c8491679f9aca9…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 01:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a5fb4bbb464c788913fdc93f85fd8d9 SHA-1: 83f0efcb941d098e70841d51210e04075e5b5ae1 SHA-256: 65c8491679f9aca927d2246975c9ecd202e6c6c3023a7bb17118d54a76ee1ecc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to search results or informational content. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+replace+belt+on+nordictrack+elliptical PDF link annotation
    • http://tezubimisigej.iblogger.org/boraks_pada_makanan.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/25390543738.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/rugowefonofevum.pdfIn PDF document text
    • http://berilunowalaz.iblogger.org/cantilena_rheinberger_sheet_music.pdfIn PDF document text
    • http://lurodug.iblogger.org/29964399864.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/daxizediwedanozudaweluji.pdfIn PDF document text
    • http://sipoxamux.22web.org/blood_pressure_meter_manual.pdfIn PDF document text
    • https://buvokatawun.weebly.com/uploads/1/3/1/3/131378806/2055922.pdfIn PDF document text
    • http://nuzadovokebin.iblogger.org/67693438185.pdfIn PDF document text
    • https://zewekoli.weebly.com/uploads/1/3/5/9/135966642/vodobezomiv.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/edexcel_a_level_biology_book_2_answers.pdfIn PDF document text
    • http://tebaxedo.22web.org/41192885975.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/model_cerere_concediu_odihna.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/ferisesuxopod-gakit-dubofitetet-nujuwigiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazasirar.epizy.com/crontab_file_format_in_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/sanibenozagiwaderurineji.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/4781476340.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/726390660.pdfIn PDF document text
    • http://bujixexugezudu.rf.gd/nukavameruxib.pdfIn PDF document text
    • http://kisolapuri.rf.gd/zagexivojika.pdfIn PDF document text
    • http://jilovin.epizy.com/atif_aslam_song_dekhte_dekhte_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/challenger_disaster_commission_report.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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 5144 bytes
SHA-256: f9950849879d1ff5a57376a2b0a3ac3385a3051b948cd29c947ec2d9d411c22a
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 10792 bytes
SHA-256: 1c669eb929d1079cf213477bf3ec782fb13df6b2a4bb7e688e0e6c32d1e8ff62

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