Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad78e4282b3bd5e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 12:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5613b5e537c3a7f572a85e9a602e4bcd SHA-1: d9b3b49b8435a6e07da5cfcd40f8b3c17ad846d1 SHA-256: 5ad78e4282b3bd5e243f144a00a667f88a34e9ae6d958706c2f0b326eb452faa
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware.

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://jottigo.ru/strik?utm_term=kahr+cw380+vs+p380+accuracy PDF link annotation
    • http://jusojixanona.getenjoyment.net/69639192632.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/69226433045.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/how_to_install_gsm_security_alarm_system.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/dilanugiz.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/cover_letter_for_cv_examples_south_africa.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/52092664263.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/ee0a525c-9163-44cf-bb5a-8b1f09e8da93/65176781943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9df93f-b8f5-4095-9907-a091238deb20/frigidaire_dehumidifier_fad704dwd_ec_code.pdfIn PDF document text
    • http://mebusojuf.rf.gd/que_es_el_analisis_estadistico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa2a705-c06c-45dc-b30a-8605bba7d80a/mozewobemeberakag.pdfIn PDF document text
    • http://lafasusatar.rf.gd/43291071216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da32adb-5f8b-45b4-852c-75ea3d55dc87/silifokibev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af072b03-faf9-4e55-a209-5b8fe240b829/kisaxatobulabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef34f468-e1c4-4b2c-a81b-2d6cc45ac783/good_writing_prompts_for_6th_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4733a962-7c41-4052-a17d-4879db0cd62f/kirby_vacuum_supply_store_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f310af4-fccf-4c73-a8ce-acfd1002ea29/john_deere_trs21_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e249175-be41-42c3-8c58-1277f2652731/zugagozobetuzufuxoninufup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd400cd-3119-44f6-9c07-262e7f1de47d/tozefutitenojuvovano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b030c8ce-22c0-4473-9014-ebb7167ec1da/51764782743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e23513-270f-40fe-9df5-8812502712ba/auvio_bluetooth_speaker_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44da3341-a53d-45b4-9aa9-559829a47eb0/yamaha_htr_5930_manuale_istruzioni_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882c6e13-02e6-4d46-9a4e-396e96e76981/what_is_the_greek_root_word_for_write.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5712 bytes
SHA-256: 627148a5a2ad7bd923fc036d8a75da08666a1fd41da8e22796dc33e495306f62
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 11648 bytes
SHA-256: f69915d9e2aa3518531f0d86f184b3cc796171117293e7407a90e4180c307185