Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c4d5890ed0a115…

MALICIOUS

PDF

67.0 KB Created: 2021-05-29 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cb02fae378e2ef2699b700505a8db8e3 SHA-1: a996a81002b10d8129ccb4cd9d92197569aa3020 SHA-256: f3c4d5890ed0a115879022d01c0d96ca8f0c80d88fa7971675c129e9321cac0c
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 high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of an embedded URI pointing to 'botokaw.ru' further supports the malicious nature, likely serving as a lure or part of a broader attack chain.

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://botokaw.ru/strik?utm_term=how+to+prepare+dextrose+powder+for+dogs PDF link annotation
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/3c1babb0712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_605a4a3019028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_605f0d6ee1429.pdfIn PDF document text
    • https://zutekavewer.weebly.com/uploads/1/3/4/5/134514418/632763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_600212b9b33dd.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/ada11739d373.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/bidaf.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/c2a3009.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/zobizibunaziwakanad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_60645250b926c.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/1912242.pdfIn PDF document text
    • https://zizetorusiwewiw.weebly.com/uploads/1/3/5/9/135990502/5895589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60680e7e3f1ef.pdfIn PDF document text
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/b2a66a9a1a4805a.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/d60858b1-292a-47d5-9360-d53bbb4e5201/what_is_rhetorical_structure_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f9c713-6c26-4cf3-b84a-e845fa3b90dd/transfer_of_heat_class_7_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdec661-66ae-45da-b13a-a0624e001f67/4326592706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6b1fbe-16a1-4fcb-9a46-916d86fdc739/printable_dominos_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9596ffd-954d-4f36-a635-73f4dd4991aa/412188144.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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 5296 bytes
SHA-256: 3c15066dddc010b479de806af0abae9924a155cc0b7d13deeca9a95086657489
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10808 bytes
SHA-256: 929817282a7e0157e08214cb9501f6e3782968e3edc173786d73f9a0e126f1c2