Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a3e1ab5d951209…

MALICIOUS

PDF

88.5 KB Created: 2021-06-06 13:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d26d1d0d8841e9366a31b121d6df9523 SHA-1: 415b6a4168705f93a0966b215109ba88d908daf1 SHA-256: 45a3e1ab5d951209d5e2f6842a50ab40d31be29be6de12c312c624e2880c3960
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. One of the extracted URLs, https://chcial.ru/pbw?utm_term=skyrim+become+vampire+lord+mod, appears to be a lure for potentially unwanted content. The document's structure and embedded links are consistent with phishing or malware distribution tactics.

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://chcial.ru/pbw?utm_term=skyrim+become+vampire+lord+mod PDF link annotation
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/fagupulefewujarine.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/5882984.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/6130659.pdfIn PDF document text
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/4042510.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/58ca011b-c581-4874-b913-56e148c300c7/44048292156.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412662/54241097393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24dc374c-9446-454c-9725-e13d40bd6d8d/why_did_britain_start_an_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742fe79b-1306-4c71-bf12-2ab3c3a0bb03/18549114742.pdfIn PDF document text
    • http://guwodav.pbworks.com/f/11781911050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878a57c8-a376-47d3-9855-f22ee4bda595/vagirikafuvajujus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9163b1-662c-45b7-be3d-8c7ab3144967/85475936634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680f4ff8-1d2a-46fe-af2c-f3be5bfb2cf6/discord_noise_when_push_to_talk.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144700803/lovazokojafubopidalegoj.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144445281/79146111747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44cb651-0f03-4a80-a0fc-cee50be1c8ca/gaxamaxar.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/gujofudukawot.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144528183/interstellar_movie_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61210826-20f6-444c-9876-e1841bca537c/dumemigumerevimozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7887298-18c6-4dbf-8478-42859c573b83/dufiwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c39e9f2-b2f3-4698-8e17-6c8092c284a4/easy_keto_recipes_for_beginners_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8be3065-6a0a-4501-aba9-a371c2990bca/76034063173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdcbb4e-c586-4875-a6b5-bf5e50ce5185/33670316708.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_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 5508 bytes
SHA-256: 514e811e021d10e39bdf1ad0ad8bcf3cf08bfa13bbf1f75e55938ba0b1dd8aee
font_01_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 11488 bytes
SHA-256: 00e0754725d57765fe65cb976b750c0bb047a24122de351c48b85a71e7193b72