Malicious PDF — malware analysis report

Static analysis result for SHA-256 b986f3f6cee425af…

MALICIOUS

PDF

106.1 KB Created: 2021-05-09 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5e6a6ecadd789e9fba1195b564336f55 SHA-1: 586aae7f6768947d00507ee7bf3fc13cfa0d109f SHA-256: b986f3f6cee425af97ea6674554682b790a49910683adf8fad79b3e36b261162
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=goblin+sword+shadow+temple+level+5 PDF link annotation
    • http://nofawemew.iblogger.org/challengers_sinhala_movie_free.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/92413008404.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/vatobonupofemovorutem.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/voviviw.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/L3KhhyZ/daftar_qr_code_my_sejahtera_untuk_kenduri.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/YwsMwgW/movistar_peru_celulares_precios.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/goOgjhd/55699926192.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/fnmoayD/subway_princess_runner_hack_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32175f5-2d39-457c-a7c9-93ce509294fe/how_to_reply_thanks_for_appreciation_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71490199-2761-4504-960a-4459bdfa3a60/tokevugomipunukoxuge.pdfIn PDF document text
    • http://memajale.epizy.com/qasida_burda_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89108c8-e45f-4906-815a-87124580f01b/what_is_the_best_pellet_stove_on_the_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf18610-b544-4fb4-891c-50ece3dff3e9/when_should_i_write_gre_for_spring_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9706e0-c39a-4707-869d-67f05defd968/microsoft_project_cost_uk.pdfIn PDF document text
    • http://kiwimusef.epizy.com/tigal.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/95879630666.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/wuvojezivopokoriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de94992b-0ec2-4aaa-a694-4d06b2e3579b/45314986436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe855a9c-f59c-44de-af1d-ea7a5acfe519/2001_dodge_ram_1500_4x4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72459ace-87a7-4664-bb80-e946f7a9030d/2012_chevy_malibu_led_lights.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_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 9452 bytes
SHA-256: 4c7d34873f2fd8e2a860671938a8c8e5ab341c33d07fbf28cd0af94bec10d11d
font_01_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 5648 bytes
SHA-256: ff129551f4664097e153525783618e06348ab194f81c05238c3af06f0f152e7f
font_02_sfnt_off00015c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3A 11204 bytes
SHA-256: 50a026a01fcfe9c57524e85bdf6ae0e55d1d16787b8a3a6903835980d16bc580
font_03_sfnt_off0001828f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828F 16308 bytes
SHA-256: bb66853c666dd9d7df0e35e13a5f327bf33d8ffb520f439547819d83a28055de