Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f7bb25a514195…

MALICIOUS

PDF

70.1 KB Created: 2021-03-21 04:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0eb3bd75761b9c707e5f961813fdfd9 SHA-1: c1c7e46db96e3941d41eda18cebb70e6609765db SHA-256: f50f7bb25a5141951051eb341da69e0d65ca3898f2c8afc571ebf1c79e0f5cc8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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
  • 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://jumiwimov.ru/123?utm_term=automorphic+functions+ford+pdf PDF link annotation
    • http://vurovolapoza.mygamesonline.org/ninisusiduzaxerusawubem.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/hPaD9jd/42188304667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_5fc979a8efa63.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/vgjmKih/just_think_inside_the_box_meaning.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/the_mysterious_benedict_society_movie_dream_cast.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/48274241325.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/ascariasis_pediatria.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff691efc635c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384463/normal_5ff632ec80021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_60015189bf047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegorabeg.atwebpages.com/kugadusakarelafenojavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737224ea-8ae6-4767-883b-d80f3e918e2b/firex_smoke_and_carbon_monoxide_alarm_beeps_twice.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/79814597.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/how_to_exercise_with_bands_for_strength.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/jududagusupamujojifor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61932365-f7c4-4d6a-83c7-1491f0238d65/cub_cadet_ltx_1045_transmission_drive_belt_diagram.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/wasazonaput.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/41201609185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166c28e5-23f6-489a-8028-f9977495ed03/dietas_para_bajar_de_peso_rapido_1_semana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312fd695-a077-439d-bb06-ad970a3623c7/garmin_gps_12xl_manual_espaol.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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 5144 bytes
SHA-256: cbfeb4278affd0a73f92e65509183b55a02cb7e81b7443e5fd4b278c1ad263c2
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 11536 bytes
SHA-256: e244abb0d8686c14d42e6e47a3b978f6608392b8331df3371ea03cf1bbce4625

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