Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336618a9567d77c…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 07:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02f66405c0fda6a9969de6526320540e SHA-1: 4959665c8e708a929586bb248f76b233dc86a443 SHA-256: a336618a9567d77c12897a300a0502ec2bfb63bca9ea375e65602d4a098f09a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical ClamAV detection and ML classifier flagging it as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs points towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=acls+2020+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386336/normal_604a1659f2ddc.pdfIn PDF document text
    • http://fasad-dom.site/what_is_the_best_alexa_to_buy_ukx7y39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_600590653ab00.pdfIn PDF document text
    • http://gatorama.fun/fenojimeluje0xoam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_60089653107a5.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/ximez_vogalikofe_linizepapomi_jerepur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_60142722e2883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_604304883b55e.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/116fc5.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/5514888.pdfIn PDF document text
    • http://vykupavto54.ru/xisasopanekatuveluzolofidu4ly.pdfIn PDF document text
    • http://rikeropovi.22web.org/65294945443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_6002b08a2fcba.pdfIn PDF document text
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/5811264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5fef14ff25496.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/sojigatelep-juxelarewiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/punurum/bigekefoxozipanilamorusak.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/degavepexoxuka.pdfIn PDF document text
    • http://tuvebiz.rf.gd/what_data_mining_tools_do_you_need.pdfIn PDF document text
    • http://jewezoku.epizy.com/why_is_my_fridge_leaking_water_underneath.pdfIn PDF document text
    • http://borinalujid.epizy.com/gumaca_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/58085306240.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/lakha_bhajan_video_hd.pdfIn PDF document text
    • http://rokanuvikokesa.epizy.com/ceidg_wniosek_o_wpis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 4628 bytes
SHA-256: 6b2b1e3ef3c143b2a491c76d73dbe93741e6094e64f6183a5ac60490f0bea0cd
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11224 bytes
SHA-256: e3d9374254d4aae9875ac624520530200e177904946ee7e7f86331f1c0a4319b
font_02_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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