Malicious PDF — malware analysis report

Static analysis result for SHA-256 d712f161361a6b26…

MALICIOUS

PDF

85.4 KB Created: 2021-06-05 12:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d18667486f151fe4df630e48068f7b54 SHA-1: 851a1c5c254c6f64d77a44c86a2f9f8c805a525d SHA-256: d712f161361a6b26e2ed8dd206dbdb309206dccd0d6feaf65da79a2b0cfd2816
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, indicating a phishing or spam distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=what+is+the+plot+of+counting+by+7s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd6765ab30c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fff6c66203f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404733/normal_60011a275b618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fecc84024dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408176/normal_5fca8efadf52c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/impossible_quiz_book_chapter_2_answers_unblocked.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144453288/20340035115.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/do_i_need_to_print_my_southwest_boarding_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297e6255-e910-4f06-8e3e-25567ffe9bf6/american_history_textbook_11th_grade.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/w/file/fetch/144620301/how_to_get_aadhar_card_copy_online_with_aadhaar_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39a383f-1696-4423-a424-ae470c49bf87/how_to_use_gimp_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaef01c-e36c-43cf-a291-0870f3d1bc65/a_raisin_in_the_sun_movie_1961_online_free.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/latagazuvebujojotobawibaf.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/bsba_major_in_operations_and_supply_chain_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a8047f-8cd0-4c48-9298-2357128e11ee/att_remote_not_turning_off_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90abe8b-cca7-444d-867c-cf82ec990d63/net_tutorial_for_beginners.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/synaptics_ps_2_port_touchpad_driver_windows_10_lenovo.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144508179/42348462772.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/90801252448.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/warobekubavajudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58878881-2c70-4290-b92c-f78c5f5b90f8/skyrim_se_modding_guide_2020_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09c4d71-a5f2-43ce-a444-03b09a741930/70272718016.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_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 5516 bytes
SHA-256: f499ff40f42c935094df005add2b40f72605d71d13befa5a39ee4524bd6c9c90
font_01_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10680 bytes
SHA-256: 6f9abe54ce3fcaa297509a7975536c6f97bbe7f91ad10e7a2e49b18cc80ba793