Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c955b91daf7cb6…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 19:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9f37bacf77d57cea0c70a1508baad780 SHA-1: 0a30ead5d2df2472bda1b2df817166cb4bc62f08 SHA-256: 11c955b91daf7cb62eaefb3a42b245cb33bfa3c6d1b93b91c5cef4992e719b94
196 Risk Score

Malware Insights

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

The PDF file employs a common phishing lure, disguising itself as educational material ('Cell process and energy worksheet answers') to trick users. It utilizes SEO link farming and redirector URLs to obscure the final malicious destination, which is indicated by the ClamAV detection as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing campaign designed to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=cell+process+and+energy+worksheet+answers PDF link annotation
    • http://gejesixave.scienceontheweb.net/bazakodajesalojixiside.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/aswb_practice_exam.pdfIn PDF document text
    • https://mugifafuvutasij.weebly.com/uploads/1/3/4/1/134108805/valetaje.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/0da7fca7e.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_propose_a_case_study.pdfIn PDF document text
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/56f95fdb8.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/radubozufiwo/95592076999.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/printable_science_worksheets_for_middle_schoolers.pdfIn PDF document text
    • http://davojuke.epizy.com/startup_convertible_debt_term_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/how_to_install_netgear_n150_wireless_usb_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/5457694927.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/makesakoxifofegi.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/activity_sheet_for_letter_g.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/avoir_l_air_en_pleine_forme.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/fileminimizer_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/laravel_form_builder_select_multiple.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5496 bytes
SHA-256: 36b5beac6ec70160168cb23a20553282bde1f7fc94f3411b0b66067e5246f60c
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10616 bytes
SHA-256: 4ff3fc43e950dd7c4d5fdc35c03e37c048df2c145a8bf098e84ce768e6010bc8

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