Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10953e47ce9a4b2…

MALICIOUS

PDF

78.4 KB Created: 2021-04-09 10:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c5e82678e3f0472f4c854e759a48ae1 SHA-1: 59a3d2398fb802910f3d9097964f7d8b0049912a SHA-256: d10953e47ce9a4b2f175ed91ca68f10d846109bbf25dff29a04747cc73387916
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=peer+gynt+suite+composer PDF link annotation
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/96abed.pdfIn PDF document text
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/zawitugowigenumo.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/gifuwajedemasel_lonoderovetol.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/synonyms_english_exercise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_60609f594a746.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/infarctus_du_myocarde_infirmier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_6062411955fe2.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/transnational_citizenship.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/a5fdc6e6-7fb2-4acb-860a-089afed9b6e2/35709503058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6aca8b-d1b1-4d9d-84cd-ed129139d3d2/girugexoraxuzexetunukeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0626c141-f74f-4db5-99d8-dc7204b9980f/lactancia_materna_traducido_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09708442-f927-44ea-8a32-4709ff0e71b0/after_the_trade_is_made_david_weiss_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da613db-cdf6-4f8d-9ea8-0ee563fe11a8/the_merchant_of_venice_arabesque_eau_de_parfum_concentr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58531abe-c9af-42e2-88f2-ae8547094aab/36312005771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d83f9e-c771-49c8-81d0-a4de2f95bedf/sibawevovosagavukobebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fcfd4a-3a98-464b-b3d8-2aee05dfa26e/17143482649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5398b0d5-da1d-4331-8357-2ab6edcc1f2f/ap_english_language_and_composition_exam_2016_multiple_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ea4aba-e431-423b-a392-09a1f9082291/in_the_mood_for_love_watch_online_full.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/lasanej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5b9ba1-4f25-4520-9e6a-21ed8171ea18/calvin_and_hobbes_christmas_eve_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17de00a-28eb-43f2-a097-4e354a1d8bbe/what_is_the_1_percent_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05294ba9-52b4-4562-afa6-3acf64eb0d5c/lupujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af788df-6d0f-4bf8-b593-0011bee78d42/pagame.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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5112 bytes
SHA-256: 56e76ea0baf5568fd82e0ed032114642178335b53c0a5f2c061a25a30ef425d7
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 12840 bytes
SHA-256: 7ef924135e0b6d48b2fa5e9f48b6ddd0d851b281f11ac802f0a8ebce0f5fc02a