Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f23c8c2bc32f89…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 06:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0503b0bd96e970cbf0a47477ecaaa13e SHA-1: 1d39b410785d0f2ebd1c8607714c3adcb1285704 SHA-256: c9f23c8c2bc32f898836e223e588b4568201e0ce1d21cb3950d08c6d50a77a18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a keyword related to search engine optimization. The primary URLs point to domains associated with SEO spam or phishing lures, indicating a likely attempt to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=cell+organelles+diagram+pdf PDF link annotation
    • https://bigunumefojetaw.weebly.com/uploads/1/3/4/3/134314030/3920623.pdfIn PDF document text
    • http://webomiwizux.22web.org/3070530888.pdfIn PDF document text
    • http://menformula.xyz/how_much_do_ipod_nano_6th_generation_cost8hqkz.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/d383f1cb5b40897.pdfIn PDF document text
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/3406592.pdfIn PDF document text
    • https://rixulajo.weebly.com/uploads/1/3/4/5/134585814/wekotetigigazes.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/4ffcaa.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/transformers_robots_in_disguiseqz6sr.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/lovoweseposevod.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/2075055.pdfIn PDF document text
    • https://nurobajaxi.weebly.com/uploads/1/3/4/5/134507542/569bae5c3.pdfIn PDF document text
    • http://coolvdomaion.online/42531954484gtr8p.pdfIn PDF document text
    • http://pornbustyvids.com/76319109347dtak5.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/dobikasukavu/runemiwirekadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/brush_pen_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/67387677163.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/rear_view_mirror_hang_tag_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/ebay_kleinanzeigen_app_alte_version_android.pdfIn PDF document text
    • http://jadaxanesutav.epizy.com/25589843861.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/51851410149.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/19819129004.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/what_does_it_mean_if_my_heating_pad_blinking_red_light.pdfIn PDF document text
    • http://mixalibomibu.epizy.com/sensory_integration_and_praxis_tests.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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5268 bytes
SHA-256: 04052f1c458cfdb68548102548f20a7fafcd6bad6f0f83efba5874fbb5bfbc04
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 10824 bytes
SHA-256: 001c1c2e6bc668a760799c995cda2b9ca9dfaf29fa72654be5ff3390ae72f66e

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