Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac6125f34d20a6…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 20:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: efbfb8ee33d2f9084c13d8fa5517aedb SHA-1: 27c515bc2bb4d9dce8dd4248d1f1395aca7583fe SHA-256: 86ac6125f34d20a6e47358ed488b6fc046d0185a7ed3267f949b5a2c9759ab3e
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 0.9993

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/123?utm_term=april+2018+monthly+calendar+templates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454820/normal_6000d8be793e4.pdfIn PDF document text
    • http://heretythere.site/nawafogatoniv78jmq.pdfIn PDF document text
    • https://kivupopemuti.weebly.com/uploads/1/3/4/3/134318129/xobojatene_pavutiduxegu_fanobux_vonolaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fe9954e3b75e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_60038965e3d73.pdfIn PDF document text
    • http://retys.fun/wibuzdujhf.pdfIn PDF document text
    • http://republvinb.fun/logitech_k400_plus_vs_k400ri2f7n.pdfIn PDF document text
    • http://org-fruit.space/wardrobe_furniture_designs_picturesmyxmx.pdfIn PDF document text
    • https://sujetobanep.weebly.com/uploads/1/3/5/3/135337497/2a831b5c505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_602f305638426.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/mevafisajak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_ff902ad336ad4f89bd6a30fb16c91f22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3488fd80-35b5-4e78-bbfa-85ae309d937a/juxag.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_c7a03ea9a05744a1aac77ae4444941d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/733a53ce-49e9-43b6-801c-66c733f08932/82928948096.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e7b37ee4947b45929e6626951de41281.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_0b33fd2b88744aa79004713422a58906.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_a2c7635293e94b36ba24c936265f46a9.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_0944442b13e54df2a0d63719b3ba947b.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_78ec3a94de23498e8e8341639be6e2f1.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_4673da9c80e74562a38a446e9782f26d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bea5b41-61f9-4ea7-acf0-87e5dcb279dc/vuwejemotupusi.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_a00fb49b15b7409b8a3b73caf6dda8aa.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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5924 bytes
SHA-256: aec0e7fd48d23e32c66423f3541c3c8159f9570d479e426be248572f55221054
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10712 bytes
SHA-256: 10e0da77859c7c95157b56e8a04ba1c96e3a8f497032440126020d88eaa41f96