Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9284f4e5ef5ae7…

MALICIOUS

PDF

79.5 KB Created: 2021-02-27 20:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8fdcc307a0a9616141850187869be854 SHA-1: ef65a8dfca00a07f3f0300048def285925bf8f90 SHA-256: 7b9284f4e5ef5ae7578cd03c46164eb13af8b73e4d96338b78ca6c65bb9ddb4a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a Tascam recorder, suggesting a lure. The primary malicious activity appears to be directing the user to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=how+to+use+a+tascam+dr-70d PDF link annotation
    • http://1xbets-regs.site/gajedoguwr3.pdfIn PDF document text
    • http://epaytds.xyz/canon_pixma_mg3122_printer_manual0q8ti.pdfIn PDF document text
    • http://sukotis.iblogger.org/fondation_de_france_guide_des_bourses.pdfIn PDF document text
    • http://goodik.fun/77319625739fyok3.pdfIn PDF document text
    • http://about-central.com/503128782xw219.pdfIn PDF document text
    • http://graatorama.space/jowimokugogosafosero3hitb.pdfIn PDF document text
    • http://demask.fun/british_atlantic_fleet_ww2nwyrv.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/invertebrate_diversity_worksheet_answers8pjtd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patilawasu/tadukotoludanen.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/84618186186.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/54579028637.pdfIn PDF document text
    • http://xixujoteb.epizy.com/are_history_books_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/nakoniret.pdfIn PDF document text
    • http://xipitidugizen.rf.gd/48618551830.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/zunufizuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/gozixifajoxuguwox.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_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 5360 bytes
SHA-256: 37585bd197ef2f501ed75ccab6da4fdc1bcdefe11fae38d5314eabd5a5e1d829
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10104 bytes
SHA-256: 04dd9ebc502663cc5793b903b2c0720f8cf841396bdbfac6f65b2b4a67aead06

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