Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca317c2a1882d09d…

MALICIOUS

PDF

71.1 KB Created: 2021-04-18 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 115a48c7a85dbbb17368408a6b8359f2 SHA-1: 904a6f6d779cb767a4e1bd5f83fc2cb3c5334883 SHA-256: ca317c2a1882d09dee8ea91a5004f31b89f38086b6dabf60b686e2b1b8ad3797
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a potentially malicious domain ('ponafet.ru'), and a heuristic firing for a 'disposable link farm' suggest the document is designed to redirect users to malicious content or phishing sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=vizio+e601i-a3+update PDF link annotation
    • http://vomoliba.scienceontheweb.net/el_atravesado_andres_caicedo_gratis.pdfIn PDF document text
    • http://reniloze.iblogger.org/unified_zoology_practical_book.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/lukijoledojikebewuz.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/xizezulesuj.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/biozone_ib_biology_second_edition_answers.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/xepazelaxis_radami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwulinivez.rf.gd/r_gupta_books_jkssb_graduate_level.pdfIn PDF document text
    • http://xidatozekef.epizy.com/bwapp_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/rigunizijorara.pdfIn PDF document text
    • http://temomij.epizy.com/alpha_bravo_charlie_codes.pdfIn PDF document text
    • http://vobogiv.rf.gd/dipped_products_plc_annual_report_2013.pdfIn PDF document text
    • http://jasigobup.epizy.com/kazesifopodiripe.pdfIn PDF document text
    • http://nowamas.rf.gd/switzerland_road_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/call_of_the_wild_essay_ideas.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/nys_biennial_statement_paper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/birds_and_the_bees_country_song_lyrics.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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 5204 bytes
SHA-256: e7e8973f66425fe529e1dd4bab81ca5eca52d78814003e8cef7be4c174807e9d
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10656 bytes
SHA-256: 2ffce90b94f73392a5307c7026daa96c4d2e5819904f635eb315848dc2928b46

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