Malicious PDF — malware analysis report

Static analysis result for SHA-256 941107323819e85d…

MALICIOUS

PDF

85.2 KB Created: 2021-05-08 12:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f5acbd481608733dcb58a6593d31049 SHA-1: 988b2b5b915e0fc1608f90b4eec55625c3a14640 SHA-256: 941107323819e85d7a04558aed33b3eeb4da290299f5753781473ee1e1fdbb56
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to `https://dafemum.ru/strik`. This URL is likely used to redirect the user to a phishing page or to download a secondary payload. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing and potential malware distribution intent. No scripts were extracted, but the embedded URL is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/strik?utm_term=toto+washlet+toilet+seat+owner%2527s+manual In PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/base64_to_react_native.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/xibeniwakamakebalazake.pdfIn PDF document text
    • http://verifybadgesbusiness.com/fitbit_charge_2_sport_band_largedoyxw.pdfIn PDF document text
    • http://zeropium.com/92665359938vwxhs.pdfIn PDF document text
    • http://roskycnmx.com/baixar_livro_o_servio_social_na_con8w6op.pdfIn PDF document text
    • http://tublitalia.space/shade_fanatic_background_5epsv87.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/dhbgi3n/commandos_mobile_apk.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/12193370032.pdfIn PDF document text
    • http://lnstagramsecurity.net/operations_management_heizer_13th_editionyts3w.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/ihejfgj/41263796560.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ihghijb/36104867099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tutapaxi/44852617157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6690f5e1-7b1e-4e6f-aa89-2b4432877319/19472844994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f37179-4453-441e-825c-9c917cbef149/45830078048.pdfIn PDF document text
    • http://polabufu.myartsonline.com/dipivozuzatato.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/ginavanisupopetesuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d07f84-35f2-4b2c-b4bc-d442bf16bd62/what_does_dio_mean_in_japanese.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/sql_server_2020_developer_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642784a7-58a4-4105-9d4f-d4b100ca6ae6/salopudiluvenoga.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/fororarojekomuviki.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/zowopofipewitapo.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/when_i_was_puerto_rican_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b3b683-df78-4ddc-8174-2fdca215137f/mothercare_jumperoo_weight_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/element_found_in_every_living_thing.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/57248791010.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 4880 bytes
SHA-256: 808c997ac1bbedfb1204ce52c90c80d26b07cd4bf7e114794b622349192c8522
font_01_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 11160 bytes
SHA-256: 5947a0e9a23320ebe70bff8e933ecfbb98eef826f3c36d7685b5446b58d67040
font_02_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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