Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4fb4a43409703b…

MALICIOUS

PDF

74.0 KB Created: 2021-04-22 23:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7575f8a5caf69e742128c4e67ee8e556 SHA-1: cfc3828651409791b455452cd38425f015a0ff19 SHA-256: ec4fb4a43409703b0da79835c91348eea2d33e51c0bd7f508822f7b8e910580d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or to host a malicious payload. The presence of external URIs and link farm characteristics further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=what+are+the+5+types+of+informative+speeches PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457006/normal_605d71f0c8964.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/4145547816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5ff4592694273.pdfIn PDF document text
    • http://dubapevokitux.22web.org/mobogenie_market_for_android_free.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5fe69433a1cd6.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/formacion_del_ateroma.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/bf09f72e-2156-4ded-b18c-8998f877672c/le_comparatif_et_le_superlatif_francais_facile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c138ab-5161-4ba5-a876-e804c45a9f13/garmin_etrex_30x_gps_western_europe.pdfIn PDF document text
    • http://relipig.epizy.com/how_to_cite_an_online_article_mla.pdfIn PDF document text
    • http://gagoxuxu.rf.gd/fevulelolarumotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e543a8c-2fd5-4a98-8b56-0085dfc1597e/group_theory_in_physics_a_practitioners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab6c1ba-b83e-4064-a151-49180bf820fa/how_to_replace_t1-11_siding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4375d167-46c2-4f9d-90ac-120f9c6025c0/john_deere_l120_48_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3396c74f-20ee-40d8-9d5c-ede014df810d/nunamowiganakivisogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e429a0d-db84-494e-8060-a0eda2e3cca6/philosophy_of_punishment_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31ce04d-2586-4749-b898-8d9953e69319/i_robot_mop_reviews.pdfIn PDF document text
    • http://tupopozavagaf.rf.gd/33534819532.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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 5520 bytes
SHA-256: 07f8cf5587cd0b319a73d6a1dfa36789a0f333e392b680739a518146b72d8d9a
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 11060 bytes
SHA-256: e33d9f821d41634302ee86051900f8988d14b2d6e854ad9dcfa74150865b09d0

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