Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f3d0230791fe1f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 09:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a7882debf0deb3459286102658ccb12f SHA-1: ac83a115ce11ad9d2858517950cb0c8e43f2dff3 SHA-256: f7f3d0230791fe1f61e3444c1ef97af03c5485ac7cdcba283ea563cb12ced402
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a podcast, aiming to trick users into visiting these malicious sites.

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://jacksth.ru/wb?keyword=death%20in%20the%20afternoon%20podcast%20season%203 PDF link annotation
    • http://scotiaenlineape-personas.com/38383961230xoth.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/livabaletazinu.pdfIn PDF document text
    • http://zixonolugajona.iblogger.org/63715469077.pdfIn PDF document text
    • http://instas.site/49900233039qd2vc.pdfIn PDF document text
    • http://xazufajemexeb.22web.org/stock_valuation_report_format.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/5457906.pdfIn PDF document text
    • http://lolkek.xyz/73505451887pu8rd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_601136bf9ee43.pdfIn PDF document text
    • http://erse.xyz/50783626245qm74v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_5ffadff5d1609.pdfIn PDF document text
    • http://klokisik.space/the_candlestick_course_paperback89vhx.pdfIn PDF document text
    • http://jevijuratovate.22web.org/synonyms_and_antonyms_worksheet_year_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_6025b2b48a5f3.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/13804518981b2hqn.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/0053fdee7b9771.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/fezojujexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodonurinifos.epizy.com/video_free_online_2019.pdfIn PDF document text
    • http://seguwogira.rf.gd/briggs_and_stratton_4_stroke_10w30_motor_oil_msds.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/9737582358.pdfIn PDF document text
    • http://pamilov.epizy.com/21740900801.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/tavoropos.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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5372 bytes
SHA-256: 3ab8af676c88a9bfa95221f19e64709e5efaf112a350dbb14768a46c2adf8e8d
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10908 bytes
SHA-256: f1258e774a883bc02ebf168e1748c41b7e47037e2b3d9f3a15be9bf9259bc175

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