Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcff3ca1a865737…

MALICIOUS

PDF

82.0 KB Created: 2021-02-24 05:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db91b5ac02ac5c5e74b78c10053dd967 SHA-1: dd66f57a999ac586a9e60628bb5f44caccc1a406 SHA-256: efcff3ca1a86573735e924aa3cc817bf16997a88cab096834945fc601136133d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI references and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The embedded URLs point to suspicious domains, likely serving as lures or download locations for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=how+to+be+a+billionaire+fridson+pdf PDF link annotation
    • http://fruittea.space/opencv_text_detection_c_examplecp165.pdfIn PDF document text
    • http://normab-id.com/49604873235fhvtk.pdfIn PDF document text
    • http://kozupuj.iblogger.org/takug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_6002614f7d016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600eccf49f746.pdfIn PDF document text
    • http://sipamuxagiporen.iblogger.org/8867213701.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/4KifYmk/rocket_car_racing_apk_mod_hack.pdfIn PDF document text
    • http://copyright-security-ig.com/car_running_rich_symptomsn59vd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fc843d5017e5.pdfIn PDF document text
    • http://opensoda.pro/epson_wf-2630_printer_error_0x60a7xq4.pdfIn PDF document text
    • http://egosikenclub.com/wasupubizalok6tixz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe0ff4fac556.pdfIn PDF document text
    • https://cdn.sqhk.co/kesumixom/ietgdhi/pivazilibojosemud.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/K7sBghx/puppy_full_hd_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/ijXigpT/nugujilipos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/povelenavuviw/53050397698.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/vejarevoxam.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/dumitetujuvokoguvabow.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/mipowagav.pdfIn PDF document text
    • http://vokutenux.epizy.com/adding_decimals_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/43365898380.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 5016 bytes
SHA-256: f7c93a2536428d0628582af93063472ecfb804792e6505935c4bb693bf4f278b
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 1852 bytes
SHA-256: 227364d9dba4550c19188fba31a52a63e2f4f414b285d49ae8d9199a01c55a4f
font_02_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10688 bytes
SHA-256: 10fcb66583dea24466c84cbf9aae5b0a0849d1ad0f2ea2ebd16baed78b961f61
font_03_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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