Malicious PDF — malware analysis report

Static analysis result for SHA-256 356bde6200691cab…

MALICIOUS

PDF

83.3 KB Created: 2021-03-31 07:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3161647bf8f4ad8d04d5b5550116fdb9 SHA-1: 22287c1cb491b22ad0391c375675fc982fb9cea5 SHA-256: 356bde6200691cab50c6877af90859e43e1b3902029e4014e431c9dbf69d3ecd
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a prominent one pointing to 'xezojetit.ru', flagged as a potential SEO redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing phishing content or malware. No scripts were extracted, but the PDF structure itself is designed to lead users to malicious URLs.

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://xezojetit.ru/wix?keyword=lds+teacher+council+meetings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe43687a2b0d.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/39648923376j7e8t.pdfIn PDF document text
    • http://rubka.space/degikadiloxetojpl00r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5ff149707e380.pdfIn PDF document text
    • http://healsmall.space/renevazatusilekegjc9a3.pdfIn PDF document text
    • http://ital-girl.space/napa_power_pro_pressure_washer_manualg23ip.pdfIn PDF document text
    • http://chambrely.xyz/why_is_my_sound_bar_skipping0jw9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_5ee861d1071c40cb8be32fb4dd814b5c.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_9deb4897b9084292bfc8b1657eccc253.pdf?index=trueIn PDF document text
    • http://wezikadedikenev.epizy.com/41519197228.pdfIn PDF document text
    • http://mizujem.epizy.com/beckett_oil_burner_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/algebra_ks3_worksheets_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/apc_back-up_500va_bx500ci.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/camera_raw_filter_cc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/logexesirowakabegawexo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/protein_gel_electrophoresis_tips_and_troubleshooting_guide.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_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 5292 bytes
SHA-256: f801af2ff82f6b2e5023c994a9d2b8fb0475bb5dd4c39cc4330525b1379aed32
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 11076 bytes
SHA-256: 8b442f8900c245674e6283db68ba8c2558575b0b757b01fea5da25f2c2fef124

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