Malicious PDF — malware analysis report

Static analysis result for SHA-256 54171a61893bac6f…

MALICIOUS

PDF

64.1 KB Created: 2020-11-11 13:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 38a0f2ad8276ad83ceb8be1ef107e5a9 SHA-1: 236ae61916e90ef2d3e007b9fa337fbe618bc40c SHA-256: 54171a61893bac6f154401321b30f565a5b0c8b08d4849f5ad86933faedf5c26
186 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 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://traffine.ru/123?keyword=circles+arcs+and+angles+worksheet PDF link annotation
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/9616235.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/e26a17f56d370.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wovexofek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fa2f6d15095c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fa48d7b23f4c.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/tiduzazavejekul.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/tufamonidababik.pdfIn PDF document text
    • https://rekubiregidejel.weebly.com/uploads/1/3/4/4/134464182/4767007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f910eca20a9e.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/47ef83d86a.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
    • https://uploads.strikinglycdn.com/files/0034bef7-19c4-4bfc-84f1-b687cd6583bc/30647722938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c544f358-0eca-43f0-b93a-bb29b11f81b2/5344529457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877cb0ea-99a5-4690-8e11-cdc420402ca1/14457691701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb08b5c-89ab-4487-a231-fe49a2bdd48f/26038642487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578a0ec2-59bc-4acc-a374-a2e8bd49c721/84243145563.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 5168 bytes
SHA-256: ec46a3db7db0ef4eb934f07c3fa64301ff484107c35362638f79666f77f33718
font_01_sfnt_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 10252 bytes
SHA-256: 05a7b90120f6edcb0b3949847f1fccd4772b133041275a784b320ff82667832b
font_02_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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