Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9c9d284e72c84…

MALICIOUS

PDF

65.6 KB Created: 2020-12-08 05:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e88eb3081dbc000ae6b3d2ad6ba61128 SHA-1: b9e881917dd8c01cfceae37c1212d331ee435e8c SHA-256: 41e9c9d284e72c84840ac3743520bc3463a34d20a1d832c84d73581d3a0ed92d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=californication%20tab%20solo%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f8b100b85e5a.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/5749687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f9706ab6fd7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fcb0f4758394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d80a860-ec84-4c14-8232-1529920d0aa4/wegotitiferira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c25760-8b65-430e-b5ce-558e9c2c4d5d/warframe_platinum_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9381895-90a8-484a-acca-fd9e34ae4e5d/1702766231.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/55649732359.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/phim_cap_3_hong_kong_long_tieng_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/60304014848.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/17547262273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50afc3a4-4e07-4013-98ae-ef4ea457425f/wedaxukopowavuboxabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99e11bc-f1af-4546-ba86-3b6687ef4912/71585624093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb67857-78dc-4402-bbba-8ae24658e52e/zesibarovomuzute.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_off0000c0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 5196 bytes
SHA-256: 15345db04f7cb63a224880efb44182f45f873c5dbfd25bb800fa359fbd5a2f99
font_01_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 11620 bytes
SHA-256: 53fe7009302cc71be6c446dbde4dacb552cb16b5e09c73b20eb8dcb1a25a8ef2

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