Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf04345cd86c16e1…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 13:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0df9b670a0d11feb798f6abf4d87588c SHA-1: 7d68e0248109a4ae530a6511203e0c48cd40fddc SHA-256: cf04345cd86c16e10fab43f88a0b19e7b5f3f9d8a13b843b7f15a6df3f8ab4d7
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jottigo.ru/wix?keyword=what+is+diagram+in+reading+comprehension PDF link annotation
    • http://kiritisivasol.mywebcommunity.org/how_much_can_an_interior_designer_make_in_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_603b055246fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6025881732389.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/mepipotoxuviguzupabar.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/kogazumeletenowozejidopoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tagisojitilu/9jjhfjj/92974983644.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/did_you_get_it_spanish_worksheet_answers_level_3.pdfIn PDF document text
    • http://fegalaro.iblogger.org/4th_grade_sentence_correction_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/hdihjj5/okra_soup_nigerian.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5ffdaac23bd5e.pdfIn PDF document text
    • http://disukikobofug.22web.org/android_10_update_for_vivo_v15_pro.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/66213447010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/christmas_music_worksheets.pdfIn PDF document text
    • http://nudoritane.atwebpages.com/vixozotukoruw.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/lincoln_sa_200_for_sale_in_houston_tx.pdfIn PDF document text
    • http://jogebelofes.epizy.com/cuisinart_griddler_deluxe_manual.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/podadora_manual_surtek.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/film_end_credits_after_effects_template.pdfIn PDF document text
    • http://tatesit.myartsonline.com/acls_drugs_cheat_sheet_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/template_cv_di_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/barbie_doll_game_video.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/zotakuxixatadedefikaxe.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_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 5468 bytes
SHA-256: daf5d43d5d3d7160ed2e1d4ad15968daa35172688a8b02d24eb0a3ea4d244f2c
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 11088 bytes
SHA-256: 4a6e08acf62a00bd3dfe9eefea17d416dcde271319a3ae9f6b307e52c9a1c7d6

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