Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef4929d6e447d6e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 06:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c677e8ebbc2526c8ec9351fe914ddbb8 SHA-1: 8c3503ced76807b9254c205a4e729d79deb2cdf6 SHA-256: eef4929d6e447d6ecc32a4e135c7d5057717d5235c46bbf24b8bb4320dc4abab
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a significant number of external links. These links are hosted on various domains, many of which appear to be disposable, suggesting a link farm designed to distribute malicious content or phish users. The presence of numerous external links points towards an attempt to lure users to external sites, likely for further exploitation.

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://druttle.ru/aws?utm_term=how+to+replace+a+whirlpool+lid+switch PDF link annotation
    • http://shmelev.pro/motorsport_manager_hq_guide4rhbv.pdfIn PDF document text
    • http://fruit-ital.space/bayesian_probability_for_babiesmzpb2.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/743a00b.pdfIn PDF document text
    • http://help-bluebadgecenter.com/beyblade_burst_rivals_download158h8.pdfIn PDF document text
    • http://idem-peshkom.ru/77260936390f4hn0.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/remok.pdfIn PDF document text
    • http://mihetos.xyz/rejelsoszi.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/wobawikozefe.pdfIn PDF document text
    • http://kpovli.ru/canada_citizenship_questions_and_answersmgsed.pdfIn PDF document text
    • http://dragonflysagewellness.com/76053011276sphh5.pdfIn PDF document text
    • http://techanomic.com/pitevelodepegewivejumegum2ehn4.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/a01d0deb3f.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/5741308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffd380cc9049.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/skyworth_65_inch_uhd_infinity_android_tvf7agg.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/salibepuvuv_rexer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5212 bytes
SHA-256: 99032136d85ed2b06ca832b573d948a7e3e088a17507d6ecb830e0262e662965
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 11152 bytes
SHA-256: 2fae6697cca92bb43a2e2781645612c24340b63f4c2539d6888609ed58feea09

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