Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dadebb2707f21c…

MALICIOUS

PDF

74.1 KB Created: 2021-02-24 21:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bc1003109d6937d1597579ee24f3a5fa SHA-1: 6c254924e4f140f9bb5f5059a68449b01016c8f8 SHA-256: d4dadebb2707f21cccc54024764ca94ccc7270cf46d99b4057e1fe69a35a44d9
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the malformed stream length and embedded URIs point towards exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/wix?keyword=laramie+tv+series+episode+guide PDF link annotation
    • http://microbladingeyebrowsdallastx.com/wrong_turn_8_full_movie_in_hindi_download_filmyzillazs68j.pdfIn PDF document text
    • http://pc-remont.website/fizuzejifelidivadusevuwiw9ux2b.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/nZiiieU/word_search_answers_7_letters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6e023eed09.pdfIn PDF document text
    • http://bioforce-co.site/3261869990dvyar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_600bb2dfb76db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fe25ddf31ddb.pdfIn PDF document text
    • http://hermidkovo.info/188095821282it2m.pdfIn PDF document text
    • http://kneeksi.ru/4580820098182emy.pdfIn PDF document text
    • http://klyshsheff.xyz/matuzovuxinonorimaxabowins2wr5.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/BjhQhbP/zombies_defense_mod_apk.pdfIn PDF document text
    • http://monoga.space/mathematical_methods_for_economics_booky8nwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_601dbfa4d7bde.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/disagesidut.pdfIn PDF document text
    • http://sovetnik53.ru/maxatigevoxanemofnz2f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff76efcbb847.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/babuxufarizuxur/ensayo_arquitectura_sustentable.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/vubajifilipoxutupebikix.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/xofuriluzobuvu.pdfIn PDF document text
    • http://widifusi.myartsonline.com/15659526593.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/31811017651.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/metformin_850mg_spc.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 5248 bytes
SHA-256: b2430afa7fa12deb9ac76a5ea1790b62a289bd2c0db89a0577aeffa35129eb8c
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10628 bytes
SHA-256: 714ee7bba1dcd591283da165db829625c36d9baa7942b6dd5cf911447176ed41

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