Malicious PDF — malware analysis report

Static analysis result for SHA-256 945a221522f80fdc…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 18:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3628a6191f4f0724f27a08bf0e70e971 SHA-1: bd0ba0e2aa53089eeef9d60dac8cb44c501ab9f2 SHA-256: 945a221522f80fdc2f5e961320e41baac544225c869a3762f864e4627afca8f1
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=twilight+series+free+download+movies PDF link annotation
    • http://artrosil.xyz/kofivogonosipulawobisif5yrn.pdfIn PDF document text
    • http://dom-bita.org/best_project_management_blogs_20206w417.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/martha_graham_biografia.pdfIn PDF document text
    • http://gatorama.fun/takufarx96vm.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/pinuzogimoxupiluybt3y.pdfIn PDF document text
    • http://grampus-shop.com/bollywood_video_songs_free_hd_1080prm2l8.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/70527560158.pdfIn PDF document text
    • http://josogub.iblogger.org/bibliography_works_cited_page_mla_format.pdfIn PDF document text
    • http://callup.today/47781213636ym79i.pdfIn PDF document text
    • http://idealslim-ordina.site/hard_bible_trivia_questions_and_answers_new_testamentzg50y.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/wolunavodelinad.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/103438560209oprh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajatumuba.epizy.com/pl_sql_basic_interview_questions.pdfIn PDF document text
    • http://pokatutabojew.rf.gd/66916438376.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/67543301821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca820672-3352-495b-be97-52f37176c260/garmin_echomap_uhd_94sv_with_transducer_and_livescope_bundle.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_6c6e639e5ca440ccac4c7d013a427334.pdf?index=trueIn PDF document text
    • http://lewinozed.atwebpages.com/what_are_the_five_key_relationships_of_confucianism.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_356753f748d84ca08c697a551faf2cae.pdf?index=trueIn PDF document text
    • http://xilibosukotijob.epizy.com/jatud.pdfIn PDF document text
    • http://litujomotoju.epizy.com/cellules_caliciformes_oeil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4abdc44-7712-4600-9afe-52b4c244d90c/why_are_my_icons_not_showing_on_my_desktop_windows_10.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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 5420 bytes
SHA-256: fc8ffaad30185b4958d992ccacd4ab75de4cc39ea1b94c66e0f3f67c59adec8d
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10860 bytes
SHA-256: 83912f0338917c561ddd4dee27262678d219da818b370cfbd1111a2c16baf008