Malicious PDF — malware analysis report

Static analysis result for SHA-256 1673f2892810175a…

MALICIOUS

PDF

130.8 KB Created: 2021-03-22 17:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c02cb1ddf00c5ec32f60320c6afdc8fb SHA-1: 1c7fb3fcb9c0efa5f8442e70c55b8a77f9f5ba9c SHA-256: 1673f2892810175a828c9f93a893142944e78bbf51b88f507b0675f073370da8
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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 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.
  • 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://dafemum.ru/wix?keyword=evolution+review+worksheet+chapter+10-12+answers PDF link annotation
    • http://leqqurint.online/lupofozaxidudivuxewmiq2r.pdfIn PDF document text
    • http://ru-en.xyz/homemade_facial_mask_for_oily_skin_and_pimplesg3lwo.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/fewogubo.pdfIn PDF document text
    • http://wusator.mygamesonline.org/povugavimifadawegugiviz.pdfIn PDF document text
    • http://creditscorehelp.info/tu_puedes_sanar_tu_vida_pelicula_descargarymtpi.pdfIn PDF document text
    • http://thailandlove.site/the_perfumed_garden_leedstta94.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/samsung_dmt800rhs_le_error_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/27957748786.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/xbox_one_wireless_controller_bluetooth_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1dac8b-53bb-4986-90d7-8ee3ccc26375/60268581393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2863e955-3d24-4432-9f85-753cdd9cda17/what_is_the_v_shred_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930dbb19-2ab8-4160-957a-6693a0e372a1/how_to_use_panasonic_lumix_as_webcam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3579d6-b9ef-4c54-abb2-14841b746981/photoshop_2020_trial_reset_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/jay_z_decoded_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7266ff51-0ca6-4276-8a1d-1fd114b4a723/dark_souls_2_best_boss_weapon_for_sorcerer.pdfIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_879b1931a8164897a6b1d10e67a59b8a.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_e57b9274131d429ea723078581599ada.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/playboy_bunny_manual_for_sale.pdfIn PDF document text
    • http://xawixojupaxixan.onlinewebshop.net/mga_halimbawa_ng_adyenda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d6111e-5e21-461e-b21b-08052c5f0f84/94164062684.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/administrao_financeira_internacional_eiteman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb38cd0-28b7-4844-9908-88ae297f637c/what_products_may_contain_gluten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fb546c-c580-4559-9287-23c7d2febcdf/vegupawoxulezilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1418a3ee-a523-4451-b0e4-1ad59452581e/when_did_stephen_king_wrote_why_we_crave_horror_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/72596096010.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19524 5552 bytes
SHA-256: 80f1a76e395e02cf04f8d7aa785e787f077fae5554c17f7adeafd9cc201eda7d
font_01_sfnt_off0001a825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A825 13388 bytes
SHA-256: 6394eb90834839098c2c94b0fff4fc9e60fa2d35471e822eff90dc15d67b13e4
font_02_sfnt_off0001d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4BD 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6
font_03_sfnt_off0001e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E991 4864 bytes
SHA-256: 2f6c507a857b80775f8c363291ae5c4d1d5d70ab32a10a47ca15bd4a80a25c67