Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7484b449b8d403a…

MALICIOUS

PDF

74.9 KB Created: 2021-05-10 13:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 12161be4b66b84521220fd7397c6788d SHA-1: e01f0e9284fadeb5a544c5453e9a0f671f9052fe SHA-256: c7484b449b8d403adadd6822659975f45bd031849ba9db12fb88f8357580d023
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 hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt, likely leveraging a technique similar to T1059.007 if JavaScript was used internally to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=what+is+page+4+navy+service+record PDF link annotation
    • http://zasazigupat.getenjoyment.net/96962749504.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/dazit_bukape.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/bakel.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/jovidiwor.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/d0371c.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/11175919405.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/study_leave_approval_letter_sample.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/kpmg_aptitude_test_questions_free.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/pekunisovuwawotikur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_cc4bfa5e56824847b951926adb09f620.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_f33b097b80f844c78634f9e8df3e9ef3.pdf?index=trueIn PDF document text
    • http://bopubedoru.myartsonline.com/fuvuk.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_176bee6b2ad84c65b0188daaf8f03d34.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/the_champions_mind_book_amazon.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/44335278381.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_f3aaf359abe3478d82d18385e86f259b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/927f970f-fa3c-4e34-bb27-53a857752cb8/al_quran_urdu_translation_kanzul_iman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0057eee4-d620-45d8-b8f5-edec691e1a7a/small_business_position_titles_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8082fbc7-16ed-41ff-bdac-e652d7d80125/82115664161.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_236254fcb6bf445ea6c6c8de5cfdf5ca.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_c70f8871d4b5496fb756e0bbd9ee369a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8549a3cc-a2fd-4abf-a0f0-22916713b1c0/public_budgeting_systems_9th_edition.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_3eea6b13379745afb6aabb3eed372464.pdf?index=trueIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/vavipugunodogegep.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_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 5564 bytes
SHA-256: 00ae759ec6cae5b087a52ebac9906c7b69acbabbb7847fe3feb8bd8ad4d76cce
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10712 bytes
SHA-256: 2beb3a3d32f5a58914097eab9ce820c60b4b6ee5ea86d818fbfbe2dc66cb8e50

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