Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d33ea7e318f55b…

MALICIOUS

PDF

68.4 KB Created: 2020-12-21 13:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d8a4a531ecdd3f0aaeb1c8fab3a3dda SHA-1: 5fd2dea70792e6cddc09b80e70fdf333e0346b52 SHA-256: d3d33ea7e318f55b12578cb67dd6919172c2416ec0a3a20d5cfb3a1b7fc5b468
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?utm_term=homeschool+schedule+template+pdf'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of embedded URLs and the redirector link strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/strik?utm_term=homeschool+schedule+template+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5f96978b5ec5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1ae8db-6027-4a9a-9cb8-56cbd73f3824/81630394741.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/waduz.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/aarti_song_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/netflix_app_not_showing_available_for.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/77406443340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b96311-e775-4d25-9109-0e1adde8962f/soccer_stars_cheats_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638a4f86-c634-40ea-a537-096fa8cdf908/prescott27s_microbiology_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f593ab5a-bd83-4a5d-8ba3-d28b7bf47185/notre_dame_west_haven_summer_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/79422273111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce88548-0333-4052-9b5e-421834580200/what_is_the_short_run_theory_of_production.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbca2e537a05ef08df7c/t/5fc38c66eaf37e3b6409ef5d/1606650983475/wavubaxenivivufudopog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67fa117-98c9-4225-881a-e81eb3d947a1/analogy_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/vovamugilok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/face37b2-3223-47b9-9448-4ebed65e1635/botunamono.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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 5260 bytes
SHA-256: a3fda985de023eceb7ec9f692d69a222564ad2a1ed0f84fd76ca7b29947a44d2
font_01_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 10332 bytes
SHA-256: b9c681178d18595b449d3431549f052193d390d52a2f699b5e508ecd1c0fbe10

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