Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca165b85129a54c0…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 18:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5492fcaea1d7c750d6ff01c51d414808 SHA-1: 940f469efcddccfa177489ef12ccfe96da6c3109 SHA-256: ca165b85129a54c0482220c494df933f2788a59d0b227190cfe714152244fbaf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://leonvi.ru/wix?keyword=1991+ford+ranger+manual+transmission+fluid. The document's structure and the presence of many external links suggest it is intended to redirect users to potentially harmful content or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=1991+ford+ranger+manual+transmission+fluid PDF link annotation
    • https://cdn.sqhk.co/lebexuzo/EolIvjc/dinujolesebosidukebarija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5fdc0a41b4cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/TgfhhJi/78503624260.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/qTyugcf/snes_classic_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/Qih7mls/86743759272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_5fd915c12b181.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/72799d81-debe-469c-95af-cf7df52f5292/xefasoguvugowedisiketilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b3ecd2-8cf6-4a7a-b4dc-33a025e443a6/machine_learning_jobs_salary_in_australia.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_25d9494c1bd34c32bc556ad6471b7495.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_4c35a139be6549939c945dafd6082a9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52211a52-a7e5-40da-9091-6d8ab4cbfe00/what_does_the_christmas_stocking_symbolize.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_36d4cc261bb0487981b53d0ea159eb4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13a35a8-777c-447b-9c67-98e62ac3dbdf/wonaretu.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_db2865093cf24268b60b59e1d446e63b.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_97923056864843cba544cc0f5dcb2250.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e80ec6-426c-4c3c-8f8d-f158943a4c33/is_rv_extended_warranty_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9da461-621f-4bdb-9291-27bcf5e9c77e/giwikivetatow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9689911-320f-4b84-bfe7-0322671c261c/fedosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2105089-354d-4cd9-9dab-8e81902b4cd9/script_writing_for_dummies_free_in_hindi.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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5340 bytes
SHA-256: c764ea24b324e46bbf1378c188f4c8a5279fd7bacb659fdfcb7b602adad10a5e
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 10548 bytes
SHA-256: d79ffbe78eca5bcdcb2b2ab79c36d477a1efb455e7a7eee0f9dd9b6e4d617d43