Malicious PDF — malware analysis report

Static analysis result for SHA-256 befca449f91317f4…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 09:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b8fb98536252762f398d884c0dcf275 SHA-1: 9c9044d0c3eb655caa90cb3457e583922bf2abfe SHA-256: befca449f91317f4ab3527841504dbc7a96fdb7d148d0a4cdeff2f444e9b6802
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=organisms+and+populations+pdf PDF link annotation
    • http://safetymirrors.xyz/zunizuzusajopofanekaper88owq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_6013c1455b1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5fd9bf155a4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_6039430a9c8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_60256c8a53b13.pdfIn PDF document text
    • http://akmurzina.com/ejemplos_de_precipitacinq4n80.pdfIn PDF document text
    • http://forkidsshop.online/where_is_the_transmission_moduleh0gew.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/886493518688fzuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd6199371577.pdfIn PDF document text
    • http://dompodklyuch.com/31316095142ypadu.pdfIn PDF document text
    • http://changely.club/python_tricks_and_tips7mx9g.pdfIn PDF document text
    • http://medtechnika1.ru/mp4_mania_hollywood_dubbed_moviesl36em.pdfIn PDF document text
    • http://satotanubajedo.iblogger.org/2721791307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_6048ddd230614.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/vunizi/34215692813.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/ben_10_video_game_free.pdfIn PDF document text
    • http://siwavubixuvavil.rf.gd/how_to_test_a_furnace_control_board.pdfIn PDF document text
    • http://gesosogo.rf.gd/nowabumabetafowen.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/42515617226.pdfIn PDF document text
    • http://nedudumitariz.epizy.com/apr_performance_gt-_250_spoiler.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/69211862813.pdfIn PDF document text
    • http://sisigetevi.rf.gd/57562758071.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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 5388 bytes
SHA-256: 9ba52e922f02f4403254fd746e14fc49727207c7a75eb14e308d5413ea0aa579
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10724 bytes
SHA-256: defd7fe94d1f100a0c8731d74ce18110ca9811a6a492b0a99697832c96e1835f

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