Malicious PDF — malware analysis report

Static analysis result for SHA-256 6903a0798f2bdb5a…

MALICIOUS

PDF

82.8 KB Created: 2020-11-14 03:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3183b5d6c91974e76fe171bbdd2988f SHA-1: 184fdc509295d84abf4c243f9e63b78defdfc24d SHA-256: 6903a0798f2bdb5a2a6f3c09700f1afc872b4119f35a502ee2a3ff859b84ebd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of these links, 'https://traffset.ru/aws?utm_term=clinical+practice+guidelines+for+diabetes+management', is flagged as unknown reputation, suggesting a potential malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=clinical+practice+guidelines+for+diabetes+management
    • https://kedupopadas.weebly.com/uploads/1/3/4/5/134588367/bb244d01d3248.pdf
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/8267092.pdf
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5f945ab2b16ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tejuvonixag/data_mining_presentation_template.pdf
    • https://uploads.strikinglycdn.com/files/7c3740f4-3343-4c61-85fa-f3d3da53df5b/vakatolavonudulezesusigag.pdf
    • https://uploads.strikinglycdn.com/files/3d235b9b-5676-4682-a078-381d9fe8004b/rixotowekevo.pdf
    • https://uploads.strikinglycdn.com/files/d29d7398-cf1d-4216-8470-5cfbe7d80d2b/zhong_kui_chica_de_nieve_y_el_crista.pdf
    • https://s3.amazonaws.com/jebokizez/39013996521.pdf
    • https://s3.amazonaws.com/woberiz/wovulavekazejerikekemodi.pdf
    • https://s3.amazonaws.com/rizijubovapuk/momoxosatavemibiwusosi.pdf
    • https://uploads.strikinglycdn.com/files/08344139-a0b5-4ab5-b87a-64e9729d7732/sasinepovewudov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f974.bin
6f8ff11a4fafceaa8269e345d7800b961e558376fd0b20feb1f9562421b3f786
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 5520 bytes
font_01_sfnt_off00010c18.bin
8f8d7367c8e998b04f7be049386979689d1a573be04fc5a5a97dae8c3090f0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 10432 bytes
font_02_sfnt_off00012fda.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 4324 bytes