Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84e3b90b2e27839…

MALICIOUS

PDF

78.2 KB Created: 2021-03-04 13:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c650f2ae3d0fbdf7f43e99d96fe70a5d SHA-1: 495e47ab06d0793828b13857c9a9e1ddacf76fbd SHA-256: d84e3b90b2e27839fe8a5320e529edf778823db9f9cc1aaa69fbb258eb77a82e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=indian+dramas+online+free PDF link annotation
    • http://ukranews.site/ribumagasikunokafunuvjq616.pdfIn PDF document text
    • http://workmonster.net/305724808793mlq2.pdfIn PDF document text
    • https://cdn.sqhk.co/mivoteloxip/xgejfWa/darokawojonuveronorupegik.pdfIn PDF document text
    • http://smeh-mif.space/wooldridge_introductory_econometrics_data_setstb8fo.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/99idhe2/famujaka.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/IXjbf9E/baby_care_products_trends.pdfIn PDF document text
    • http://com-connexion.xyz/92440782980vw5bo.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/Aoribg2/dapizuno.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/jiwepiwewotupavirolifuva.pdfIn PDF document text
    • http://keysecret.ru/after_action_review_form_freesfv4r.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/84508fb5-9903-4320-b4fe-bac18ff0e2c9/who_makes_white_rodgers_thermostats.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_ac9cc43042844629a95699f0bb73572e.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_f9cebdfc7bdd4ed4985e591e3042cd06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60faa2e8-e787-4935-9b98-adcbc68957f1/un_metro_cubico_cuantos_centimetros_cubicos_son.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/libro_el_secreto_de_selena_gratis.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_eaf6574d34664cd78605c71ad9c79c13.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_253ade5fcfc8454987e7402942e41e3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc9749e-5026-4271-9807-ad6f218997d2/international_marketing_manager_jobs_in_india.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_098584575bbe4471af1f09cb70368425.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_6b79d07712084dc88fbd2f84af4b3af9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bebb59d-2ad3-43f0-80a8-f1af559d38c2/bubble_answer_sheet_1-100.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 4988 bytes
SHA-256: 3ab91906b942436a118bde191ae8c55e0c15791e5530680d08aed4c70cbf4698
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10488 bytes
SHA-256: 26f97ae3c0365975e7764418adb12b5a4ebf4367b1e79a0785c898035a7ab667
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 17844 bytes
SHA-256: 2d2dedc8a08f487df713e01a10dc352205820da9cb89f002ec6374710eb5d659