Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ed90c8e6d820da…

MALICIOUS

PDF

89.4 KB Created: 2021-04-03 20:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a1b91f3ff92bd2873ca235093f29139 SHA-1: cc4d1a78bfadfc42fa711bf09ea1a82281319cb1 SHA-256: 00ed90c8e6d820da87cafd491ecf676c9cfe35780b1caa8ff5dff3e74eb7fd7f
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan distribution attempt. It contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary lure appears to be disguised as a technical drawing resource, directing users to download further files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=principles+of+technical+drawing+giesecke+pdf PDF link annotation
    • http://br1.red/meganimed_descargar_tablet_messenger_apk_modc3mr5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fcaf57a12e03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ffd9b8c0ef2c.pdfIn PDF document text
    • http://aviabileti.ru/vesemonuldga5u.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/d2881.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/ketufe_papazusasezowu_gabedegogak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60078ccb97c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_601ff0fb2e65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366047/normal_5ff3afd5ece96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_600e9a0cc5b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fd944bd12ca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5ffddf7863098.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/dulixa.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://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_84527aaac77f452a9a20b520243bbf66.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_97f716fad69b4909a545bdeecd3f7e8a.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_1ccbd17ff0a24538a3d1c1fa70184a3b.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_7c48a7d86de4498c97f5d1c6b79b0893.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_151750999ed14245aceeda2221265c46.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_250f7caa62a546cdbe360fb7ef4bf4ec.pdf?index=trueIn 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_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 5364 bytes
SHA-256: e51ad7c1da1cd412bd253a798992f208d6ac5f64a316c5307e5fdfb455f4d51d
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 11816 bytes
SHA-256: b837acd81b1fba90a3c414234ede16ffd6bc10230b2215633c94c79a5f8c8d64
font_02_sfnt_off00014a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A58 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f