Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd20bf8029c76d42…

MALICIOUS

PDF

94.2 KB Created: 2021-03-31 13:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a5bc6480e4febf8d5965ce306c121be4 SHA-1: 0bcf040bc4b436bed01a6a73a78bee25adc7730e SHA-256: dd20bf8029c76d4214bf4c6396689a6653b22ad6780848353f99650857800e43
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=problemas+de+caida+libre+fisica+resueltos+pdf PDF link annotation
    • http://milanomoda-italy.site/lujaxamesilusaborojabili9up.pdfIn PDF document text
    • http://azules.ru/how_to_structure_a_comparison_essayxkd9d.pdfIn PDF document text
    • http://andyhongdigital.com/346627453872wt1x.pdfIn PDF document text
    • http://dirtygirl.fun/howard_miller_grandfather_clock_wont_chimef9fqt.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_6eefd72640c64fa6a0dda504223b4d74.pdf?index=trueIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/18551381035.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/jukemipafe.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_6d75319cfe224860b1938ac91baf8726.pdf?index=trueIn PDF document text
    • http://gujimosodaza.myartsonline.com/causes_of_the_south_african_war_1899_to_1902.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_1fa182010dd444f191d3fbdc9f8826e8.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_97527cba46cd4e7c9ec69d5fef784a32.pdf?index=trueIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_b82d2ee346a94097a361212b857ff0d6.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_0624c0bdb60e4664ad6c1f900f7a6ae7.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_e3ddf023dc944dc983b8074add51da18.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_74fd647abf9c4980b7a74e3b15e4194d.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_a5c1195844b048829108ba6127a15b9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffce89c-8527-41cd-a4f9-6388ba8ef1da/do_i_need_to_reset_thermostat_after_changing_batteries.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_f4efa4a6043043008e3659afb48b23eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/895c95d8-7548-426b-a32b-9433519f475a/jiximadimawemedexolo.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_f1b14120486646d8bc1d77aceca3f79a.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 5444 bytes
SHA-256: 0b394e0fcf0deeef2772a5ae95bc6e9d2dd9524186b06a3dde03f8853d7990e8
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 3676 bytes
SHA-256: 6f803c8a689252d04eb9652ec0707aa8a9d8d79ab5c29f0312b18552f8e7c6c3
font_03_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 12264 bytes
SHA-256: 4be1d6a3811c0504bccb695b2a03a04f18a44bcfe4487a0e54079bc34de4d06e
font_04_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 16516 bytes
SHA-256: af4781aeafe963b13a767e6bc26e8d2b5f3668e5dc1a76272f8ef6f1bac07ace

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