Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f1c57cdc7700f…

MALICIOUS

PDF

75.6 KB Created: 2020-12-24 05:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d7ec12c3310111ab2a7a336da25e347f SHA-1: 70ebeab8007cc9f5a2b8851edb29dd61d19e776e SHA-256: f88f1c57cdc7700f7b5299cc7291d8f67dd3ba1f20f98a3cf01da414eb6eb358
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, contains references to 'Amber wright interview' and the authoring application, suggesting a social engineering lure.

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://traffset.ru/123?utm_term=amber+wright+interview PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8d38fbba1b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fce900fd4bb3.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://uploads.strikinglycdn.com/files/302186f4-edee-4702-bab7-b7747eaff88f/lexageduzinupiwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afa68ee-7d22-44f4-86d2-73e1ed474acd/vuzibesezofoxuvusumafukun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aff9989-67f3-4a36-b0a4-98a28bb1c92d/sulafemefalajiluxofetuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ca51d0-e25f-4ad4-bb53-0b8251f2a1a5/avg_secure_vpn_product_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/15897744835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ecc41a-dd67-477b-8ca8-3d9e96309af9/rukolotokukexenodoxowop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550e57ef-38d2-4c1e-9e94-c79f85965210/hammer_and_chisel_deluxe_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f72d89-f04d-4578-b819-3feec68ce68d/anatomy_and_physiology_elaine_marieb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b5aa6b-b61d-43fc-9a2e-e074ac4f49c7/tofw_2020_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/blouse_ka_design.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 4640 bytes
SHA-256: a6669b1a4a41ce797d3741261c9b97b625c1e29461fb9c8d3b3626d872821a82
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 10176 bytes
SHA-256: bd9e8ffa63682b102b0d1aad42bb79ea6201950a8fc4a3d83a307a0dfb58b9ea
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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