Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e00c016eda4da43…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 22:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 25b7d4764221672a8f3d9f8f90be1d4c SHA-1: 56770e9a9c066bd6dcc0d66d82e1bad8ab5999f1 SHA-256: 8e00c016eda4da433c104357a2de498091a41d3b22289fb140612175ab8eb138
186 Risk Score

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-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.
  • 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://soxebez.ru/123?utm_term=cg+b.+ed+syllabus+2019+pdf PDF link annotation
    • https://cdn.sqhk.co/gobuwovuv/tzXja8h/bmc_software_glassdoor_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/mihr9jf/26590067966.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/hSN8sjb/furniture_mod_minecraft_pe_1._16_download.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/7616499.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/kimazixirozu.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/mavilivisev.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/9a2541483.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/bebusovulutemejeji.pdfIn PDF document text
    • https://niberijiv.weebly.com/uploads/1/3/4/0/134017170/xakaxufuwanap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_4486a5075b5d409e98de19c1fe95c71f.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_98ded3d6edb143d291a3193bafe1d5ee.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_d190ffd4a9544372840dbfb18e67442d.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_ee94760345bf49ea848eec1653286b1d.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_559ea62e2eb740e4a949081b02431e2b.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_94638a4207b1461d9ae5901c4829a193.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_51ec7d740dc44b8b9b8eec5e15dd377a.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_b88203c0b7c743119cd23dc9ccee6169.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

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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5772 bytes
SHA-256: 518aae3e95f2a63f835e335bd064a32ae12c7bd827893217358c81728795bcb0
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10640 bytes
SHA-256: 65cc76b51d29ad2164c573c0d727697194d1eec1d88cccf4a7cd82fb96b53905
font_02_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 6804 bytes
SHA-256: 81f50aeb53e590ef91d8619b93a53a78a2458286102f7c5b48c0d8d6d3d894e0

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