Malicious PDF — malware analysis report

Static analysis result for SHA-256 645de9eaae381c6d…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 01:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 258228016a56fb327507c5f8f6054789 SHA-1: 2f1c0609aacb74119aaa2370245d106e8575d1b9 SHA-256: 645de9eaae381c6de890d8fcd4a17636c5ccffefb1e7bed9aa00d7bd85ff6224
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary lure appears to be a "World of Warcraft Cataclysm Leveling Guide", but the embedded links, particularly to 'resalured.ru', suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=world+of+warcraft+cataclysm+leveling+guide PDF link annotation
    • https://s3.amazonaws.com/fosalizuzu/android_developer_mode_mock_location.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/best_mysql_books_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/32117400882.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/45191814171.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/kadinaratezodemuraviz.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/interstitial_lung_disease_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/nacte_guide_book_2017_18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_6003b4af404e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/babok_version_3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe89359-c69d-4bce-8bae-33b4c9881680/bidofixinovaxemutadewit.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/53979511981.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/calendar_method_of_family_planning.pdfIn PDF document text
    • http://vuzudaru.epizy.com/toruwewitapodorixutovajoz.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_2579d429b02e46c4ac8a1b058f7c64a1.pdf?index=trueIn PDF document text
    • http://gefetela.epizy.com/gaxerelogipibewuzix.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_497f77d53bb34653a610c44bc8ddb034.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_3135bf6fba8e42bd9c479020389090a5.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_564e9e713b1a41d7b590a20bcf97222f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9966520e-7961-467f-ac0b-dd85d9266372/nalavefiwarezabesi.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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5608 bytes
SHA-256: 9cec70413dc575192a660c71241bdf31f401767e86041a0d5c17444808738cdc
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 10724 bytes
SHA-256: b4c04fd2a640c5bf63636d04a9a823dbc2b4a22ea09992c3671146db79706a92