Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6f2e2245a0fe12…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 04:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a928b164609f6379cfb6918c890d3c8e SHA-1: 2c245659107a8a6aaf055c15c80997c761d3a45a SHA-256: fe6f2e2245a0fe121d1123c739e3a91e252b88706f5ba673c2fc97e2759836f0
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=do+infrared+heaters+really+work PDF link annotation
    • https://cdn.sqhk.co/goganededem/pijjdcA/concrete_compressive_strength_test_report.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/eK4hffY/one_touch_dunk_2d_arcade_basketball_game.pdfIn PDF document text
    • http://m-laskin.ru/google_english-spanish_dictionary_online8pexw.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/cJxhamu/jupisuwatej.pdfIn PDF document text
    • http://cpatrump.com/ielts_book_6_test_3_answersgyfa6.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/Eieih7W/university_of_miami_spring_2020_tuition_due_date.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/igPTvLC/stickman_fight_super_dragon_shadow_war_mod_apk.pdfIn PDF document text
    • http://sibuvre.com/tp-link_tl-wa850re_n300_universal_range_extender_broadband_wi-fi_extendernntg0.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/iJoEhhs/woodworkers_warehouse_manchester.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/mjcEzKx/war_of_galaxy_wiki_comic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_386ae18354a14221a853be4b1e23a3ae.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_cdb8b79f497044e990c43f6ad562ad3d.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_52cc240c9f1d45f3a6843b5a712ee80a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/80816230620.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/1080p_bodybuilding_wallpaper.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_825facde6b2643dd9a4d4404b17c9ab3.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_bece1a7cf77544b299cc444dcdd13ddd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/73684322353.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_956082c12a6b4332a9d9d986aa0cb89a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/braveheart_film_music_free.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_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 5252 bytes
SHA-256: 72f8cf0b1e59d79eea74c749862071fc0a4a672712493437a162440ce9513d83
font_01_sfnt_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 10732 bytes
SHA-256: e1e023a230bf01db1cb012f83bfc07ff0a6933374f75c977afce75ec33d57074

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