Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c9c2d5b4d02918…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 14:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f212dce1088c65eba3a21c84a16c1fbb SHA-1: 554b35c270f4990ab3719210180292a66bb817e6 SHA-256: 52c9c2d5b4d0291858db396a4fa4a7e8ee0fc3e8b9d5a7e36b8bc601afc5e7df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm designed to redirect users. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to deceive users into visiting malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to facilitate the download of further malicious content.

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://ponafet.ru/strik?utm_term=civil+engineering+materials+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fe78eceae6e6.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/jfpOgcv/gunatofon.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/bgd3jfR/steampunk_go_launcher_themes.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/javubinasupe-vosonuzikomorew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_601fe240ee07c.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/ieiettb/the_clubhouse_liverpool_drinks_menu.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/what_is_not_an_example_of_critical_thinking.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/iajdjbh/history_of_christianity_in_northern_nigeria.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff0165e66b7a.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/71898730619.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/3f883d52599.pdfIn PDF document text
    • https://jalamipitifem.weebly.com/uploads/1/3/0/7/130738892/gulira.pdfIn PDF document text
    • https://jopazidavasuzu.weebly.com/uploads/1/3/2/6/132681438/0090a74fcf.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/icifijb/cnbc_live_audio.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/3b9dd1eb-cba8-4266-9063-cd46729c7994/73526985021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25e7d6d-6724-4d68-99d3-5b9ae28996f3/kumubiwu.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/best_defense_lawyers_in_oklahoma.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/86535152999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3048a428-444e-42ea-9780-e65f8cf5bfd8/28124227628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3034abe9-06c8-4a0e-aa23-bb0a05a321db/84475638745.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5420 bytes
SHA-256: 05d814072e5b6824930b8c7ef494ba8614f469efc28c5593e2e737ac096ec7d4
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10472 bytes
SHA-256: daa5467ba1d45053aa398f8d746af5b30754be9596707142aed3307005b46900

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