Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c661c77bbe640b3…

MALICIOUS

PDF

73.1 KB Created: 2021-05-11 09:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4fb0728528c2bae8052798b78e3b63eb SHA-1: 72d799fc525460551764440bcfd3d1e58e31c70d SHA-256: 8c661c77bbe640b3fa367bfac0ded73bfa047435207019022c1ae5b122785c1a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=convert+keynote+presentation+to+google+slides PDF link annotation
    • http://wanuzib.22web.org/mupudugo.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/ZBjiifn/it_s_a_small_world_coffee_cup.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/best_research_topics_in_geography.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/dYno9x7/ziwefosemagazezu.pdfIn PDF document text
    • http://dronextactical.xyz/taylor_digital_waterproof_kitchen_scale_reviewgja8b.pdfIn PDF document text
    • http://ogranicbio.fun/grapple_guide_d_d_5efi961.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/new_classical_economics.pdfIn PDF document text
    • https://cdn.sqhk.co/finefamokevo/agfz3hd/android_gmail_file_location.pdfIn PDF document text
    • http://dutov.org/chelsea_fixtures_2020_20x96o4.pdfIn PDF document text
    • https://cdn.sqhk.co/lutakakijuro/iahcjio/273493469.pdfIn PDF document text
    • http://nikomodemudajo.iblogger.org/motexuxuvoteraferulifute.pdfIn PDF document text
    • http://idealica-ufficiale.site/how_to_do_psychoanalytic_literary_criticismxtlgy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoloxufiz.epizy.com/buffalo_bills_current_injury_report.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_1b914f5337a7448c853853e184f3069d.pdf?index=trueIn PDF document text
    • http://pivomowofafo.rf.gd/58774238778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d297fa-fa91-498c-80bd-e8f53257d236/40753436615.pdfIn PDF document text
    • http://denakisewir.epizy.com/what_ply_is_caron_simply_soft_light_yarn.pdfIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_38f778b11a2e4259b209c3389bf45c90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03e1b8f-0953-4839-81cc-27b369d78a88/6466148868.pdfIn PDF document text
    • http://zudozam.epizy.com/galvanized_iron_sheet_size.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5256 bytes
SHA-256: 0fe9d65d3c5f980347c154cef11d4593686bcfdcb5805bfb7494077e5ce6fcc8
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 10916 bytes
SHA-256: 9efada3fa5d701de43b46d10bc8838d209d88727c9815a76e551849b747e5ecd

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