Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84aec3e3ea8a4b1…

MALICIOUS

PDF

78.9 KB Created: 2021-04-27 11:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7ad72d351c696b4f676715344c1e2c87 SHA-1: 492019dbbc389320082cd8ee5754ce01f031ef88 SHA-256: d84aec3e3ea8a4b1f770f95581d2ce6c8836df9bd8d67f7674ad5a494b4e2d2b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' in one of the URLs indicates a potential tracking mechanism for phishing campaigns. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=short+stories+in+english+written+by+indian+writers PDF link annotation
    • http://tonadep.22web.org/asus_aura_sync.pdfIn PDF document text
    • http://bilapak.66ghz.com/tenses_exercise_for_class_4_with_answers.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/lilijaxononu.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/souad_brule_vive_livre.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/wuvemuwukojujuz_rogobata_zorowawegin.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/rurokirometidup.pdfIn PDF document text
    • https://fogenidu.weebly.com/uploads/1/3/4/3/134391000/eede7.pdfIn PDF document text
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/jajodubolukaxuta.pdfIn PDF document text
    • http://fasodotujane.iblogger.org/hp_envy_4500_printer_settings.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/believer_lyrics_download.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/xewamejixolefaj/relative_clauses_test_with_answers.pdfIn PDF document text
    • http://puwigedonokapav.epizy.com/34993194459.pdfIn PDF document text
    • http://tawatibajat.rf.gd/53453131113.pdfIn PDF document text
    • http://zowedejiwut.epizy.com/pdf_file_reducer_mac.pdfIn PDF document text
    • http://sarososibi.rf.gd/edit_in_paint_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/26920647542.pdfIn PDF document text
    • http://fanuzisi.epizy.com/formation_of_acetaldehyde_from_glucose.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/bobol_wifi_wpa2_psk_di_android.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/jamipesazat.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/adpro_xoa_client_software.pdfIn PDF document text
    • http://mumeriladokovot.epizy.com/vuxajoruweraw.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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 5524 bytes
SHA-256: f493b7aec0284f48912f02f5ec33a67621d37293bc23dae735f634e5bdc989ff
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 11232 bytes
SHA-256: 2f5de5f30919e3131b575e012b5b76e7c9df0b754cf6e79ab8a640563229e056

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