Malicious PDF — malware analysis report

Static analysis result for SHA-256 45669bd8a642514a…

MALICIOUS

PDF

79.3 KB Created: 2021-02-24 09:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b887cc04116110065d5a6622c62a3d0f SHA-1: f88316eb8de31a31a63217376dd5faa5b501aa3b SHA-256: 45669bd8a642514ab423f5b968eea2dda8d724092abc12df6da71b9680be4f72
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains, including 'baarspo.ru'. The presence of PDF-specific heuristics and the nature of the URLs suggest an attempt to direct users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=selenium+example+java+maven PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5feb559b8bb85.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/kowoxavegipiwusebar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff621ca4e5b2.pdfIn PDF document text
    • http://emmetrix.net/company_core_data_sheet_ccds_templatekyqxm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fdd32542f95f.pdfIn PDF document text
    • http://stileidmo.fun/wedofag1l8ja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemakeruw.epizy.com/93640866868.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/23356817271.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/rotiwabuvojatufez.pdfIn PDF document text
    • http://belinoremujuk.rf.gd/babawulolizuriworo.pdfIn PDF document text
    • http://jawigunomuj.epizy.com/bsplayer_full_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/compound_words_worksheet_with_pictures.pdfIn PDF document text
    • http://bemisiba.epizy.com/safiduvananexesogesupolut.pdfIn PDF document text
    • http://xezabesazigida.epizy.com/xixuzofasiveri.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/allen_bradley_plc_programming_manual.pdfIn PDF document text
    • http://dinijeti.rf.gd/bituthene_lm_data_sheet.pdfIn PDF document text
    • http://lusiromipu.epizy.com/39671579808.pdfIn PDF document text
    • http://zuboxevu.epizy.com/zidepuxufajegeteziv.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_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 4996 bytes
SHA-256: d3e50649df562e43666fee95367dd7f00802f712d69b3ae084002e8ca59e4f1e
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10828 bytes
SHA-256: 6b4b6ccfed6343511c79497b3a33ee627a1d7f48248c14b0a976c70d4100f77d

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