Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c118e98848cd7…

MALICIOUS

PDF

77.8 KB Created: 2021-04-17 11:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0931fa20e89a7df003aa1378659ffbe3 SHA-1: e8bf94ce4694cc492b53876072e5e42193287ccc SHA-256: d91c118e98848cd796ae761298dd12c9e84f0ecf9b1bd5c7a81b71573f8b3273
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://lozipotod.ru/strik?utm_term=texas+go+math+grade+7+online+textbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369332/normal_605aac2d933ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6026b3ba16bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_601254a4208cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_6036b8bd5c10f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_60045489b8832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5ff20b21762d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462376/normal_60066013ebb69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_600d1787cd77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_6015ab070bdc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5febc256e33f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fc7d65e22aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fd6ccf7afe85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_6004bd1a3dfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_604460c24fd9b.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/fa2b42c1-17df-4a48-aca3-729d166066f3/does_water_have_a_net_dipole_moment.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_2070133cd24a4d5ab07b3107db1fc9cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08db1e9-dc61-4b1d-9db8-d0dde4c4dae5/53506899817.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5cc5069d30fa4916befd6fa474564704.pdf?index=trueIn 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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 5540 bytes
SHA-256: 1b4f2b864587e542987d1b7423593b6a8b26b3256fd388ce34e77f67b63fb854
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10796 bytes
SHA-256: a91c4178de00b502bba884dea41608fb984ba0c8ef0140ea4965b33ae0674792

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