Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f251451b1fd91a7…

MALICIOUS

PDF

108.6 KB Created: 2021-03-30 22:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c7f860914b756212b97bcb57fc130014 SHA-1: dd3f4005e1872b84ef131a721ef1695b9cfd23e9 SHA-256: 9f251451b1fd91a7edb6988444e0d7454c86dc14826b364d5bf3ef2fd322cf17
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=ectomorph+training+guide PDF link annotation
    • http://pararapameso.getenjoyment.net/getting_started_with_spring_framework_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/5jihb1U/77711801875.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/86062197769.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/arc_length_and_sector_area_worksheet_geometry.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuwisarov/jbibhg3/neostrack_gps_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/88nyhdk/aim_interim_reporting_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/iiehcv0/28328344717.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/24331771645.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/syntactic_ambiguity_examples.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/life_application_bible_commentary.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/JmhgmIQ/wexopivir.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/89146525577.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/37844997200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_a3be6b3bc73f4a7a88dfd235badf90cc.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_817e684ce7e242b89c443a6561666b51.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/critical_thinking_worksheets_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33492bc-a5de-4433-a008-9373a0257a7d/72019381457.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_065270ed11034bbfbc9010edcb04d503.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_ce5afc7b95a244c29f13f3f67af66fe3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1252e446-bb68-4a21-bbc7-4b1ae9e67745/nobotininugusasetusilipu.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_c8a860a7b3134962bd8ee2027bfc9999.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_24316a8a8a5b4eff9e0fa9a19d5d1709.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_33d033393f9041a09dad20baa7e7291d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ba3266-19fd-4747-8168-25f9f43d2fcd/rivoparijizimipik.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_off00016d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D46 5236 bytes
SHA-256: 2890a0a5b499772ea494c4a11b06d648af9d6521a6889d518bab6cb24f9b5e54
font_01_sfnt_off00017eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EEC 10476 bytes
SHA-256: c7e94eccd53d0ab46f8e5eeec62cf21f6a1cfd5cf52124efad3b338bcc713986