Malicious PDF — malware analysis report

Static analysis result for SHA-256 4646983394b12317…

MALICIOUS

PDF

79.5 KB Created: 2021-06-14 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70ee9a6516674a4be396f7f736d7d529 SHA-1: 40b0e5218701b4f0b7a526594f977a4d80cd0e22 SHA-256: 4646983394b1231762869cdc3f816e95a47e5646f2fdeb3c6e23064e5fe8a596
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to direct users to potentially malicious websites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting an attempt to manipulate search results or distribute malware. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=food+for+today+first+canadian+edition+textbook+pdf
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/keketeto-xijozozon-bupegeduxumota-rojovix.pdf
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/19bc49e03d.pdf
    • https://numevajuga.weebly.com/uploads/1/3/0/9/130969633/vuvojukedajip_kibuka_mugivanej_vobavibalemete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a54dc3f4-ab5d-4a12-aed6-3fcd2ab54511/kelley_blue_book_used_car_values_free.pdf
    • http://zegugas.pbworks.com/f/what_is_metaphor_in_figure_of_speech.pdf
    • https://uploads.strikinglycdn.com/files/b7b028a0-c93f-4795-9986-29b77847a6fe/seposilotijijalasixofiv.pdf
    • http://mogulobobis.pbworks.com/f/is_there_a_way_to_contact_robinhood_by_phone.pdf
    • http://ziduzobif.pbworks.com/w/file/fetch/144790899/what_oil_does_a_ford_focus_2013_take.pdf
    • http://gurilotav.pbworks.com/w/file/fetch/144823920/how_to_remove_handle_from_ge_spacemaker_microwave.pdf
    • http://zopujoxobug.pbworks.com/f/angry_neighbor_apk_indir_android_oyun_club_son_srm.pdf
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144785847/compilers_principles_techniques_and_tools_second_edition.pdf
    • https://uploads.strikinglycdn.com/files/1704ed15-74fe-4bb0-84fa-f64e6ff34c59/introduction_to_calculus_and_classical_analysis.pdf
    • https://uploads.strikinglycdn.com/files/b08ca504-bc7f-4f9c-91a0-db3ffb75af00/why_my_power_bank_is_not_charging.pdf
    • https://uploads.strikinglycdn.com/files/5e999ae6-b5e6-45c4-854d-4a84f64562fc/bhagavad_gita_course_online_iskcon.pdf
    • http://xuvabufoj.pbworks.com/w/file/fetch/144471963/apeman_h70_trail_camera_set_up.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e8.bin
2a8bd8fc05b915c56a97e0a896f01cc15e2829fc614273fe060049ba8376ca13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 5232 bytes
font_01_sfnt_off0000e7ce.bin
7b1e4c68eba568116741b7716e6336898d84595f2425c6091d8293236894a59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 10356 bytes
font_02_sfnt_off00010b47.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 16204 bytes
font_03_sfnt_off00012074.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 4324 bytes

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