Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f918b653347a508…

MALICIOUS

PDF

111.1 KB Created: 2021-03-15 03:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9b7de4e3bc5e06ba0ae6b16e034c2732 SHA-1: 27bed6572f828c7d8d73c51be399365c063fa00d SHA-256: 3f918b653347a5084f06864ee332f5547c3d291fc4f4f6b83246406ae178739e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://midufefew.ru/wix?keyword=john+kanaka+history. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a non-standard use of PDF for potentially malicious purposes, likely to redirect users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=john+kanaka+history PDF link annotation
    • http://misifebofol.mywebcommunity.org/30062548445.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/gfjdifp/59396369791.pdfIn PDF document text
    • https://rilolani.weebly.com/uploads/1/3/4/4/134459611/2b8b74cc46.pdfIn PDF document text
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/1515252.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/7487856.pdfIn PDF document text
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/fuwudojuzewudozusiw.pdfIn PDF document text
    • https://mowewudogib.weebly.com/uploads/1/3/5/3/135310369/vukag_joxofamisit_bolamow_pejokafuj.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/hehiqpR/59225142395.pdfIn PDF document text
    • https://fexifetonazez.weebly.com/uploads/1/3/4/4/134492485/7022513.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/mavokuwekimaso-jaterun-jonasatixitog.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/dell_optiplex_7010_driver_pack_download.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/getting_to_know_arcgis_pro_second_edition_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donenufalu.rf.gd/64422338828.pdfIn PDF document text
    • http://goxakimolo.epizy.com/xizuvefukavixufez.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_d1b4ab6c1c7644fba9f2c0c407002c53.pdf?index=trueIn PDF document text
    • http://kanisisasulaba.rf.gd/bipakiturenebojob.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_71fe2453731f4c9eb394028864e4fa1d.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_094e34836917459fbebf2d298372a598.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_6590785843ea493094fb11fefc8601ab.pdf?index=trueIn PDF document text
    • http://banumekopi.epizy.com/juboni.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/dogozoxi.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_4743ce3b19e4423ea49da60d837d639c.pdf?index=trueIn PDF document text
    • http://gujimosodaza.myartsonline.com/sex_and_the_city_2_cast_names.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_off0001729c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729C 4896 bytes
SHA-256: ccf3082fedba4a35ae4dca061a445c89135c72695bde334d32cd72bf2042312c
font_01_sfnt_off00018342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18342 12480 bytes
SHA-256: d77d4872c26e08786caccc12626136328c94b4a02e83feb7897731551deb5ece