Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c11d9341d764f6e…

MALICIOUS

PDF

126.8 KB Created: 2021-03-19 19:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b0c7dfa1fd93915785557a803cff41fd SHA-1: 588e899c90cb8ca18e280402042eaadda6a1023e SHA-256: 7c11d9341d764f6e9789b49cd7dbdbfccefde89b38385d7a962a825262b4d7b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=paradoja+aquiles+y+la+tortuga+pdf PDF link annotation
    • http://salonlabs.xyz/how_to_repair_samsung_rangecgk59.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/igijiUv/jack_s_world_new_york_city.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/geBawOd/87069526205.pdfIn PDF document text
    • http://oficialshoes.site/jojajiwigufejajiwuftoyk.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://jakartapro.xyz/explain_the_steps_involved_in_product_designf08rp.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/ji0ia9J/minecraft_pocket_server_hosting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_d8a98127072b4b21881d427521adf4e6.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_0bbb43ec036542e3bf59b565ea52a5fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6d63f0-3061-4fab-b2f1-f8f4e14a794e/what_are_the_steps_to_write_a_poem.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_816d9084697b414fb7ab1c6ddc899fde.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_6a0a94b8e0984c52911cae672e49cfdb.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_6e28a74967724c318f4eba5310371e28.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_f4b20a5697d941dca8be500e3ce7dac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7011d0d5-ae87-4c1b-93fe-bc05bb21809b/how_to_stretch_plantar_fasciitis_before_running.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_50806007a1a347f4afc1c70198b55eb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c74bb2-ac8d-4c44-ba23-d0764cbeb203/stack_on_gun_safe_keypad_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13688f46-1b3a-4c76-9520-f146ab419bd0/45903379801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df01aa91-7122-415c-a58d-a789d18d007a/60777471219.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_6a18c7a5dbcd464fa3a44c37ff4493ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2385e50d-a2df-4de8-b6c3-e6030cb9deb7/valajaxobutafutolebun.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_off000191bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191BB 5512 bytes
SHA-256: 99a25b27d53c691660552288f57e4e0adf58f1499d737cf73ddbeb393da9bf33
font_01_sfnt_off0001a48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48A 15912 bytes
SHA-256: a4cc027d051ea266a816b4fd4544553d13c94a6a15f5c1b16e3bb68a41eb754e
font_02_sfnt_off0001d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D5 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb

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