Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4f53f3e5fcbc49…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 12:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 03adc7c8cfdb2559abc46db1eed3e6b1 SHA-1: 8f234dd66a408ad8f1b23a0a3f45adb734a090e4 SHA-256: 4d4f53f3e5fcbc493a949441fb3bf15bb77da5462113dcbd1107317c324cf330
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS classification. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to a 'birthday letter', likely a pretext to drive users to these external links. No scripts were extracted, but the presence of multiple external links strongly suggests an intent to redirect users to malicious content or phishing pages.

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
  • 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://ponafet.ru/wix?keyword=birthday+letter+to+my+daughter+in+heaven PDF link annotation
    • http://siwupojotuj.getenjoyment.net/calendario_escolar_primaria_2020_madrid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_601bc4e933463.pdfIn PDF document text
    • https://bizekexejanagiv.weebly.com/uploads/1/3/4/5/134593847/gagutolawu-jeketorope-fuwaz.pdfIn PDF document text
    • https://cdn.sqhk.co/tumitibira/igRhahi/19755473766.pdfIn PDF document text
    • https://wemakevarovafa.weebly.com/uploads/1/3/4/6/134636541/ravopoferoruvo_vufovifafe_revorefegolosol_gibovobojodab.pdfIn PDF document text
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/zapova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_60482fb621c12.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/C37GIig/2955171608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_60029b4e05615.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/c233a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_6033bae0a6fb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekapajekuxipuj.rf.gd/how_to_reset_a_rca_tablet_to_factory_settings.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/aulas_de_violo_para_iniciantes.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/how_to_fix_kitchen_faucet_spray_hose.pdfIn PDF document text
    • http://tikimolanevi.rf.gd/41317847572.pdfIn PDF document text
    • http://bepenaguvofiw.epizy.com/breville_smart_oven_air_fryer_french_fries.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/how_to_fix_a_garage_door_opener_-_remote_not_working.pdfIn PDF document text
    • http://xulodolab.epizy.com/xozelapurexabijirerotoxa.pdfIn PDF document text
    • http://wogafut.rf.gd/acer_aspire_v5-571p-6631_specs.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5272 bytes
SHA-256: bb427b230f1b6c60e4efdf419c702947bdc276e7f2d408e77cc38e7e711cf6c9
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 10900 bytes
SHA-256: 3d300a27825e27499f2e4f99c01e57193d01227ed78d0ebd67f94c1e3a6baaf5

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