Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec43669287776e1…

MALICIOUS

PDF

65.4 KB Created: 2021-03-03 13:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 15331efd9e83ae99f40ed4e8a5a382ba SHA-1: 4119336b1ac807baf10afb785398935842d3f470 SHA-256: 1ec43669287776e149cb84859825114cb694f0c0214f5ced2e09fc993c5998d9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for running commands via LOLBins. The document body, though obfuscated, contains references to 'how to cite articles chicago style' and a suspicious URL, indicating a lure. The presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt, likely involving exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/123?utm_term=how+to+cite+articles+chicago+style PDF link annotation
    • http://vuxiparami.22web.org/dedelonuwirilewelup.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/aTjhggg/dr_jun_kong_dallas_tx.pdfIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/formal_dress_stores_in_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/tokyo_drift_2006_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/caddyshack_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/the_forest_crafting_guide_steam.pdfIn PDF document text
    • http://zamudijofo.epizy.com/ajax_jquery_post_form_data.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/windows_server_2012_upgrade_powershell_5.1.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/bulimi.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/bisazabe/anaconda_movie_picture.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/bidivo/aloe_99_soothing_gel_gelee_mask_sheet.pdfIn PDF document text
    • http://nototen.epizy.com/vocal_remover_apk_mod.pdfIn PDF document text
    • http://baloxes.epizy.com/61795749243.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/burger_king_grilled_chicken_sandwich_calories_no_mayo.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/91264486709.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_off0000c553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC553 5216 bytes
SHA-256: 2e8457618e2d28be739c9050a6382c7a1f4bee606b096a109b5985768f48974f
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 9816 bytes
SHA-256: 619179e09a8f07589d9e557a75a429e68fe6718cc824c86bbc1b1aa2039b1713

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