Malicious PDF — malware analysis report

Static analysis result for SHA-256 cace735a7c7b20e3…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 20:26:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e7f924d8c7d04135d832d0b13aeefd72 SHA-1: b1eda415f89999a8f3b32301be62ede0ab6c02c1 SHA-256: cace735a7c7b20e34be0beb443d59f842a7ed780adb1e96aab1047e651b5d953
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The document body, though heavily obfuscated, contains text related to accounting and software, likely serving as a lure. The numerous embedded URLs, many pointing to disposable hosting, indicate a link farm designed to redirect users to malicious sites, as confirmed by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

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
  • 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=joint+venture+accounting+journal+entries+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_604f1dfbd00da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ffc0b765cb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_601b00533931b.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/26921937566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_602ad9e69d698.pdfIn PDF document text
    • http://jesubenodewopob.22web.org/49985532141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_5fda15610a069.pdfIn PDF document text
    • http://noxepometiv.iblogger.org/pdf_bestanden_samenvoegen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawexega.epizy.com/java_runtime_environment_64_bit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce37c5e-dd66-4e94-b4dd-26891aab6ffc/27571330070.pdfIn PDF document text
    • http://petikagemejol.rf.gd/agar._io_skin_hack.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/jodazenoroju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fc97ae-b9d1-49af-b481-31f7fb6f0e89/a_murder_is_announced_play_script.pdfIn PDF document text
    • http://mudubotumiti.epizy.com/91364378992.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/ferrari_roma_for_sale_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/zewijilawijudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b22b0c0-200e-494d-b937-54a5d834b0d7/vabesefu.pdfIn PDF document text
    • http://tofarogupa.rf.gd/gopro_hero_3_specs_comparison.pdfIn PDF document text
    • http://sufumawug.epizy.com/baadshah_telugu_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d67780-cbd2-43fb-9511-7f419ab22d5c/25515503705.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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5448 bytes
SHA-256: 404427d7d38a491bf5beb80deb54f16f570db314b70401458eb9cbe6d6127513
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10196 bytes
SHA-256: 567e7d6e3e1c1a444232a1a942242de54073870b15a11e455f5a96aeb6df1aa3

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