Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79333a1f9682135…

MALICIOUS

PDF

78.2 KB Created: 2020-11-20 05:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f9a1f2d6ed2798d15f3363ad598f8529 SHA-1: 9bd49c1abcdf753c8c527fb594e37d6c2f51cd81 SHA-256: d79333a1f9682135000bed22ba5216d6e6df40cdb7122e5147ef485320bb3de4
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 0.9996

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://trafffe.ru/123?utm_term=reds+stadium+seating+view PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f9961e0a0ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f964ebded06c.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/zabutijabokubusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fa9a97a0f1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5f9cbe05a5b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5fb2a9205da4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_5f99f601d592f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5fb3461a50fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5f91cf51d4ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f9d18e71c59f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f88a804dee36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_5fabdeff6ab45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5f9982b19995f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f8b7ccacc359.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 4948 bytes
SHA-256: f3e6fb20aad70755fbf5a409bf79eec0710627451171b7e8e70c95fd8019bfef
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10904 bytes
SHA-256: 7594627dae2adb4a00accc5fcbe5696fa2052ab56693175ef8608e4c0a2d72eb
font_02_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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