Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca22adf89244b5…

MALICIOUS

PDF

74.3 KB Created: 2021-04-02 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eccceb46e6c80e91a9e4c40cbadedee3 SHA-1: c940dea275b362fb67f47da74a95ea2609054e5d SHA-256: acca22adf89244b5c53e7879ff2160d85b45aa491e510686741480de5cfa5759
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable hosting, with a critical heuristic firing for malicious redirector links. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://dafemum.ru/award?keyword=commbank+home+loan+rates+pdf, which is likely used to redirect the user to a phishing or malware download site. No scripts were extracted, but the document structure and URL analysis strongly suggest a phishing or malware delivery attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=commbank+home+loan+rates+pdf In PDF document text
    • http://workshop-fb.ru/fadejivewevadaqbepi.pdfIn PDF document text
    • http://all-system7.work/97036791859gyxqs.pdfIn PDF document text
    • http://zinekob.66ghz.com/64377774348.pdfIn PDF document text
    • http://fasidubeni.iblogger.org/puvenupanerux.pdfIn PDF document text
    • http://mebelintera.ru/joxeguroxotedevebipus0u1i.pdfIn PDF document text
    • http://instapodarok.site/955138168771u26t.pdfIn PDF document text
    • http://libertinemodels.com/clash_of_tanks_cool_math_gamesi2xn6.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/3de01c3.pdfIn PDF document text
    • https://fekubikutoji.weebly.com/uploads/1/3/4/1/134108901/6239174a0.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/raravirux.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/6561710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/600c357b-73e8-4ef1-817f-d5037269f825/las_bodas_de_sangre_resumen_corto.pdfIn PDF document text
    • http://tededuliwe.rf.gd/kozuxapafajadabatokupakup.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/nafibi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/how_do_you_crochet_a_beanie_hat_for_adults.pdfIn PDF document text
    • http://wabalan.epizy.com/bocio_nodular_y_multinodular.pdfIn PDF document text
    • http://sikofus.epizy.com/best_online_coding_platform_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c32f7ce-2f75-4506-98d4-be2915a1f6ec/gevemitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc753f9-562c-4385-8df9-78aa0beb9f0d/41848278484.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 5392 bytes
SHA-256: ab03e22f5c1fa96262293f2becd2dff8a1c46b590392157eca7a748caf7bb103
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 11408 bytes
SHA-256: 27d7ea751aa26deeb3d739e4b6a7106887e6efaeba8594856157bfb18e457676

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