Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3f9e9410cdb085…

MALICIOUS

PDF

66.4 KB Created: 2021-03-05 02:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 953e41e18b2d098bb0412a77633e1a04 SHA-1: 0d1f0d97e92e5d22a801c9d81d77880e294e73c6 SHA-256: 3b3f9e9410cdb0852ce2e85da9601377e3c3f39dc3a76fe162fe967d2e03d89c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it is used as a lure for phishing or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are strong indicators of a malicious document, likely delivered via spearphishing.

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
  • 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://crophysi.ru/award?keyword=chattanooga+hydrocollator+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5fce05a317264.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/hjicjdn/lifetime_swing_sets_costco.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/bevimonevufenojunobisuze.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/OVahepS/zenoxiduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601f5306ce54f.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/r6E6pje/nonstop_balls_challenge_39.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/48452200542.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/qigiayc/black_friday_sales_now_at_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/idZomjd/53503091017.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/Lcjegc8/woodworking_tools_crossword_clue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_6030795ba2d21.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/nitidadufetenu/make_up_princess_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c5b760-03a2-4fb2-9c84-2bb8b648e951/wool_hugh_howey.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/91724334093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefa4aa-8f8c-4db6-9ad9-66b3029a2992/digital_painting_lessons_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06da6fbb-404d-416d-a6ff-7cb88fed2e0d/39329055984.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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 5184 bytes
SHA-256: ee27ed6860cd6f039ffdf4d011b8e09f42eef8406b185599ee6516fcb862f5b4
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 10064 bytes
SHA-256: 3c67dc8c196657f40da669862aab647c9a69dc4701292b090a682fc5c292db35

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