Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72a7eb44835152e…

MALICIOUS

PDF

93.3 KB Created: 2021-04-02 20:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 32d6a7236d5ac8b9d928a53393f26431 SHA-1: 45d184bf0d04cebc2e8c96673cb83c60ade945c4 SHA-256: b72a7eb44835152e1a47706be54d23b3fb6362feebd211547ecc758c2d14005f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL suggesting a search result lure. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of embedded URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=islam+question+and+answer+bangla PDF link annotation
    • http://scm03.ru/accountancy_class_12_question_paper_20172ncua.pdfIn PDF document text
    • http://sesalon.xyz/rawoxasakikuxaraxeg6zx29.pdfIn PDF document text
    • http://delayikapy.xyz/35117035070j8l3l.pdfIn PDF document text
    • http://smcjd.com/53860398569p7wyh.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/85898829951.pdfIn PDF document text
    • http://faromobipon.22web.org/days_of_the_week_worksheets_ks1.pdfIn PDF document text
    • http://50offshop.pro/fonevufipupakrnlz.pdfIn PDF document text
    • http://chambre.xyz/342757779717bsk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvaxideta.rf.gd/97245496128.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/41260830787.pdfIn PDF document text
    • http://vedebimefawimad.rf.gd/nubamomivixe.pdfIn PDF document text
    • http://wawutanow.epizy.com/pyrex_laboratory_glassware_catalog.pdfIn PDF document text
    • http://fitubupit.epizy.com/49878520382.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/52628541900.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/aluminium_6061_sheet_thickness.pdfIn PDF document text
    • http://madekubadasa.rf.gd/halloween_songs_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/approximation_theory_and_approximation_practice_trefethen.pdfIn PDF document text
    • http://vezoxonu.epizy.com/5751783367.pdfIn PDF document text
    • http://jufalemel.rf.gd/bobine_lectrique.pdfIn PDF document text
    • http://susosutudufat.rf.gd/zabolepujitute.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_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 5440 bytes
SHA-256: 57514299c5cc80d1094b6be71766242834a7381a94511e7647c01b03586ae750
font_01_sfnt_off0001442e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442E 10572 bytes
SHA-256: 33adafc74735090fb31cd1bb4a467f23f4bd3c884618c399efc3b89f5fd5161f

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