Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59732515f9708af…

MALICIOUS

PDF

88.4 KB Created: 2021-03-22 23:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba81aaf6e38b8e3da38ca929de4b2661 SHA-1: 2f26cd857bd76443e2eeeebca2fa72d4539f4fef SHA-256: d59732515f9708af3fa01f2b1b2f30a5fe561ff2f8ef22b3fe17dca5de8b1094
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 0.9996

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://botokaw.ru/strik?utm_term=what+is+the+first+step+in+the+ethical+decision-making+model PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5fe1a7d21b316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602d8cfe339c7.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/jukixuzigebe.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/5966912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_5fd7ce0443cd7.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/nagevakapipuxukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5fdc88bbb408d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_600c52dae0771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5fca807acf18c.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/titebafekeganisa.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://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_845b6e8f86c5490abe91f1d14b8befe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d69d3a1-3a7f-4af5-9d20-efd02026f61e/10900261215.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_118883e680624805b32f1e832d09d680.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_c39a1165802747b2b4decb598f3a35ad.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_20338c99e0c9446ab6407df21f9c6307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac2d1f6-8f27-46f2-9a39-e9fde45b7927/kenmore_canister_vacuum_parts_model_115.pdfIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_c9ac360e30b7485ab2a965cca68aee75.pdf?index=trueIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_3fd07748170640cd825320b6f02661af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8748b00b-e3b3-4574-bff9-33a429c152d4/10121149877.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_657a79c1b1164db9af3bcffe48069051.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_239d9dae4fa74584a10bf5f57ab6561e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 5464 bytes
SHA-256: 9eae13db9db3bfde4b71e8f3234c85e24ec0003fb69bd3ba55682fa550bec635
font_01_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 10568 bytes
SHA-256: 2ac30790b8b94247fc64218f1793ed98e00be23f3bf83b96d858371110f80589
font_02_sfnt_off0001457b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3