Malicious PDF — malware analysis report

Static analysis result for SHA-256 646027bcc7cde732…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 10:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6dc35919ef0c16bd1eac165ebad2f4a9 SHA-1: 56dd48fe605b6a27214571d981d43e4e4cc990a8 SHA-256: 646027bcc7cde732bafe78bf9ff40fcf2ea3a7cdbde00ff6fb49885dab52a5a1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a malicious URL points to a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=calendario+agricoltura+biodinamica+pdf In PDF document text
    • http://blockingscenery.com/what_is_the_best_coffee_for_a_keurigx14hs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5feb9120f10b1.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/ePgg4Z5/business_development_plan_example_ppt.pdfIn PDF document text
    • http://sdek-24.cc/sanyo_tv_codes_for_charter_remote6r92e.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/jbIhajd/23331455798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_603d3876e5019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_604fa32b231fa.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/JijNLje/mutugejipixekuvimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_602439ee2df7b.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/1igtvPk/58802763511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ff4a31fdf744.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/nerugiraxura/xunatumovepotijeger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3d8dd3-e44d-4f64-9865-4f415b6db5d1/vukulonikovaxomele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcc462c-c16d-4d2c-83ad-d6fb7cd08c2b/a_guide_to_rational_living_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/fujikowetokiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/album_aerosmith_greatest_hits_rar.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/count_on_me_piano_sheet_music_musescore.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/8514048315.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_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 5340 bytes
SHA-256: 474f13f482e92961e35bf331bea6ccf648ce4f02f67831ff7b5dd988a9be9be3
font_01_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 11612 bytes
SHA-256: 8dd40a9dab8a6942c0f10a736330646097fb99fa167526dc6e883d0cdf720034

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