Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb59cd1384e85229…

MALICIOUS

PDF

82.3 KB Created: 2021-04-19 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: be3fe933324e9ff2b369aa4d184a310f SHA-1: 5a950dc4a9793b9d3560fceb0ea8cfda86bcb123 SHA-256: eb59cd1384e85229a3d735c402179d1d23accc64a1d4dd9b19e1ad78cf4432aa
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external links suggests a redirection to malicious sites.

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://bologen.ru/strik?utm_term=cards+against+humanity+funny+answers PDF link annotation
    • https://cdn.sqhk.co/tinawegu/jhfQ4jb/nulovafutuwewatixojebafil.pdfIn PDF document text
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/kesoxof-sifuxo-xogejuxokofi.pdfIn PDF document text
    • http://help-igcopyright.xyz/zikerofavo9s6cv.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/BgfohGs/hack_wifi_root_android.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/jotagefiser.pdfIn PDF document text
    • https://mivagefe.weebly.com/uploads/1/3/1/4/131453450/165753.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/wuvaganatob.pdfIn PDF document text
    • http://medtechnika1.ru/fopaxoresukubonibufijirfk80u.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/jiEoyij/encarta_dictionary_apk_free.pdfIn PDF document text
    • http://ledukamu.iblogger.org/javascript_basics_free.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/didijosa-sokafexotizo-vowevilu-fivufaxuris.pdfIn PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/4994449.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/vawikajenosi1w898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubafezin/how_to_treat_cellulitis_infection_naturally.pdfIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/nolal.pdfIn PDF document text
    • http://revenunazikun.rf.gd/72665675723.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/what_is_a_good_recumbent_bike_for_seniors.pdfIn PDF document text
    • http://mezifaxura.rf.gd/3_digit_addition_word_problems_worksheets.pdfIn PDF document text
    • http://jurolabadujo.rf.gd/prepa_abierta_ingles_1.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_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 5388 bytes
SHA-256: a1414c99495b0fdb8383fd8ad00f3cb6c1f7b63402157f3b87bf067ff6ebd684
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 11096 bytes
SHA-256: d688a5ee5647e1053afa1da1be48d132718d5f9702bf3d91663d7c3139606a9e

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