Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4551f22caea578b…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 00:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 61ae88e43cce126942749b0e54e5e24f SHA-1: 2386f25dc3ff752bc36a0a46698323acdedf1909 SHA-256: a4551f22caea578b1c5ef5900e45245c45939d5c6d2320f53d092d2213af427e
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one, 'https://baarspo.ru/award?keyword=afternoon+with+irish+cows+poem+pdf', identified as a potential phishing or malware distribution point. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further suggesting malicious intent. No scripts were extracted, but the presence of external URIs points to a likely attempt to redirect the user to a malicious site.

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/award?keyword=afternoon+with+irish+cows+poem+pdf PDF link annotation
    • https://cdn.sqhk.co/reromiwo/ichaRhf/learning_quran_online_from_pakistan.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/71931551730.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hia6OsY/aptence_parent_connect.pdfIn PDF document text
    • http://befipekawuzader.iblogger.org/fotekudifarunomogi.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/how_to_boxing_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/Zhbii4e/kasawoveboju.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/UifI6Sl/magical_dressup_butterfly_fairy.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/b2geI3D/21796996528.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/the_tax_collector_film_2019.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/66047694258.pdfIn PDF document text
    • http://masevetito.22web.org/paper_chromatography_video.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/XjdkOCA/27942543817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuluxewamotate.atwebpages.com/chung_elementary_probability_theory.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/dallas_fort_worth_map.pdfIn PDF document text
    • http://vififaraw.rf.gd/42779981064.pdfIn PDF document text
    • http://tatesit.myartsonline.com/old_ncert_ancient_history_class_12.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/617818629.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/bomopesuroxidutaribaresam.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/loduxovi.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_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 5232 bytes
SHA-256: 2af0aa6b63d925a37ade692c9b8b38a228b41bc0c81c30db02c8c6fc4a2b431a
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 10632 bytes
SHA-256: c77072abe677aa8ebfb5ce12720d969e844c8b92de6ac0a8385d6dd45547b371

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