Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56aa852e773430…

MALICIOUS

PDF

103.9 KB Created: 2020-12-17 14:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fcb3b1e9d512cfb4a87cc2351145d04c SHA-1: bfb0f74cbe952fe7b3ce27a3db3c536eb0c80576 SHA-256: dc56aa852e773430fadec39242b09b183d5e8a96bf1e7f6215457c8c5b7e4965
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing lure and a browser installation lure, suggesting a social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL points to a suspicious domain, likely serving a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/strik?utm_term=sadlier+vocabulary+workshop+level+e+unit+10-12+review+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fa7d02499934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fa5418c65ce5.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/jolufozo/writing_developmental_stages_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/sogotitigisumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb18a601-1a5b-425e-bf62-234fd2d5fa86/72498385550.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc971c8c741314319700/t/5fcf270d7cc0b10a0acb2503/1607411471349/tasamojotanulezumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca860703-69e3-4b11-8c2c-31c4f33c316a/kumon_answer_book_i_math.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1366588c99b6d37a92994/t/5fc77289a907d7439cdb986a/1606906507478/best_football_team_manager_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b9efbdb33045eece00d9/t/5fc8feb5c8182c67444a83fe/1607007926222/goxizafureraje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5553ea5bc066edfc301bb/t/5fc687c9cb3e0f577133a9f9/1606846423815/ball_sort_puzzle_level_1079.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe12344e98326c02d7bd0f/1606292023276/does_best_buy_do_price_match_with_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/chiisana_koi_no_uta_lyrics_english.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_off00015ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD2 6080 bytes
SHA-256: 6c1ff9bbfe98818ec07b241989a6a9b5e493a1e737a14de8f56e2c42aac58ef3
font_01_sfnt_off00016fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA1 10136 bytes
SHA-256: 03ab1dbf7c388bf6b4b36fbfc8ac8f19ec7fb286f19f10838ea07f5a2598e64e

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