Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec5b7ad79d31b4d…

MALICIOUS

PDF

71.2 KB Created: 2020-11-22 20:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dad6577e66f6492eca7e815627438adc SHA-1: f0f9ed4cb56c89445e3e708c4c5dc3741df5437d SHA-256: dec5b7ad79d31b4d7dbf3dab1ad0d3ab600ccc630a683723b2298ed7a6669c21
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://cctraff.ru/123?utm_term=why+study+government+lesson+plan'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

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://cctraff.ru/123?utm_term=why+study+government+lesson+plan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f95ae7abd4a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f8b2d0b509ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5fa852eeeb5f4.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://s3.amazonaws.com/fapaga/incident_report_form_nsw_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/electrolux_renaissance_vacuum_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/82050620621.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/40418369492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f08d39-94c6-465b-927f-3ada5ea43542/20211744989.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/conflict_in_hamlet_act_1_scene_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/46679791647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7218bd5-e273-45da-adb2-c3bd0bd36dfb/pantone_formula_guide_solid_coated_uncoated.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/kiran_publication_bank_reasoning_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/this_pretty_planet_guitar_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647b31bf-b07b-4edc-8d31-8664eaa3651e/35622577107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63952edf-6664-487d-ade8-7cc7e1b2c9aa/28239278932.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_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 5380 bytes
SHA-256: 11cf0429efa5b835e0b92e3477f9e25d7feb0d5699f14cc616652d32aad7eb01
font_01_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 10716 bytes
SHA-256: 35d46a83bca359b2b525285e3cf16926fc56ae978738d7257ad43c1fc91150ee
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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