Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76aa0f4da8011c4…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 10:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ec87bd4e42e50c0c096f7c7b426324f SHA-1: ce8912a9e47533cf4227b7909418591f466c1ad5 SHA-256: d76aa0f4da8011c4e57cc681dea50a98b18b1c2cb095289c521e5f9e69e5a1f9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=what+are+the+different+types+of+wiring PDF link annotation
    • http://josumewemuzob.getenjoyment.net/how_to_draw_a_turkey_art_hub_with_shapes.pdfIn PDF document text
    • https://cdn.sqhk.co/mivivezar/VgciafE/32854698953.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/merchant_of_venice_summary_act_4.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/jogan.pdfIn PDF document text
    • http://paselon.getenjoyment.net/87834674611.pdfIn PDF document text
    • https://janososa.weebly.com/uploads/1/3/5/3/135326085/8690252.pdfIn PDF document text
    • https://magalezofutik.weebly.com/uploads/1/3/4/5/134599277/rotomu-gulimisawinux-gizafivugememu-bavabedifutep.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/the_ultimate_gift_movie_worksheet_key.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/niwedukikegafodumuwofus.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/ifY39hc/dice_roller_online_stopwatch.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/pibjjJO/draw_it_too_fortnite_raven.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/hghijnj/itbp_ka_full_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/778f7a54-07d8-410b-9712-c89d1d084f28/kenmore_gas_range_parts_790.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_do_a_budget_in_quicken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc08f46-ed2c-4831-bf46-2cc2933b012e/temarixekuzikobexeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c5caa0-0e53-4349-b691-640191bdadb7/the_secret_hero_rhonda_byrne_wiki.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/viii_cules_son_los_criterios_que_orientan_la_educacin_en_mxico.pdfIn PDF document text
    • http://roveramo.atwebpages.com/virux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcef2d1c-969f-4753-8130-fd04f428daa6/12383667730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15802aa-5f37-44b6-90ca-431177ad6e98/40587877209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1168ec8-f0cf-4754-b52c-f1ba00520cab/how_to_clean_ink_absorber_brother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8632647-07e1-4215-a5b6-66405df253b8/vanity_fair_outlet_mesa_az.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5268 bytes
SHA-256: 2523f71fa977edce6f9cdc3d29eec5b791bf02db8a3e2ceba2c33bbc484f743c
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 11424 bytes
SHA-256: 1571260f18fa6e9017008637429f9dcfb4b84018449d7468b1bd2920f883056f
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c