Malicious PDF — malware analysis report

Static analysis result for SHA-256 125109a7702086c9…

MALICIOUS

PDF

81.6 KB Created: 2021-03-31 21:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d208d79c5d152140590a767d3e9be1e8 SHA-1: e7edbd16b7f5fae33b1194da8195792d9ee0c2b6 SHA-256: 125109a7702086c9bae78a12a82d6eb14e67d54d8fda0336023a449044d998b1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to a "ccna study guide pdf 2020 free download", suggesting a lure to entice users to download the malicious file. The presence of numerous external URLs, many pointing to disposable hosting, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=ccna+study+guide+pdf+2020+free+download PDF link annotation
    • https://cdn.sqhk.co/tamikoveken/22iehix/98373731693.pdfIn PDF document text
    • http://lazadacostumercenter.com/hollywood_reporter_most_trusted_news_anchorsrxvsl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_603d518023f6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5fee93715fe99.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/icgVFhb/jisorogenedewonekefefol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5ff1799c4181f.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/gdWmhjL/wumaluweluxob.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/51829570298.pdfIn PDF document text
    • https://lotitarep.weebly.com/uploads/1/3/1/3/131383228/82ed8f7ab653fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6058ff5c415ae.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/gesurukiraxilo.pdfIn PDF document text
    • http://circulshtangcalip.website/lifetime_adjustable_portable_basketball_hoop_54-inch_polycarbonate6i9c1.pdfIn PDF document text
    • http://soxexuv.iblogger.org/78019429879.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/regakezowemososeja.pdfIn PDF document text
    • http://cartest.pro/401832306571m8bw.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/xawalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokaginiw.epizy.com/zokejagevozu.pdfIn PDF document text
    • http://baponexar.epizy.com/online_agreement_format.pdfIn PDF document text
    • http://kozinid.epizy.com/fundamentals_of_equations_of_state.pdfIn PDF document text
    • http://zapusov.atwebpages.com/data_analysis_in_excel_2020_tutorial.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 5696 bytes
SHA-256: 8366ca112ce683ac95b44aeeb4df77225197d50c6e66342f418c352eebf4933f
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10996 bytes
SHA-256: 9e60794b8c81d2c43c23b698cf328edccb2527f7c96ccc99499f740bb505c514
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1

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