Malicious PDF — malware analysis report

Static analysis result for SHA-256 6887e8ae638c5411…

MALICIOUS

PDF

73.2 KB Created: 2020-11-24 03:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4897fe35fc84b81139fa07372012b6a1 SHA-1: 163e34bb2315e78c64fa36c413b30c418d28ab65 SHA-256: 6887e8ae638c5411bced16fb673626788b4ac4351b49891fb81bdc287de11b46
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'eat that frog' and the wkhtmltopdf application, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/123?utm_term=eat+that+frog+pdf+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f97cfdf86bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f8b82983e27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f89f9699e5de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f9f28efca9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8735fb76b99.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/jewizopukuni/revuxufuwol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5247198d-44d9-4b19-9984-5638eb156364/70459450979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd6bb23-49c2-46cf-9075-e730acab3d9e/luxanenizokazazigurekunul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94aee1f1-f34c-4317-a422-72305f15a94c/farmers_market_activity_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/antianemic_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/afk_arena_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb8f7cb-234d-42e3-8aa1-6ee320b26308/zukesawivewiwimom.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/juwadolisogowiloviwi.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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 5048 bytes
SHA-256: c63e48e29991ba8eae15d8c7764d4f9496434a8a6cfe4462c02ed559cfac8ae4
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10492 bytes
SHA-256: 56c4cf2dc524dc3618dc9fbe3c47ae6225560fc88d71bc9d98fc9e5e4112c7ba
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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