Malicious PDF — malware analysis report

Static analysis result for SHA-256 c652c9c9abc54913…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 10:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b7ed645d77ca784cac1599453214832 SHA-1: 22e6930b6106fc24e06dfd93cd71bce6de0f94f3 SHA-256: c652c9c9abc54913aed29e025faf17c0e04bfa2c8b5a17398fae4052df9df3bd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://botokaw.ru/strik?utm_term=why+was+the+great+society+a+failure PDF link annotation
    • http://bukapim.mywebcommunity.org/49060427993.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/lhajigf/dixie_d_amelio_song_meme.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/does_my_head_look_big_in_this_read_online_free.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/teoria_del_aprendizaje_social_bandura.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/FjaOZhj/horizon_blue_cross_blue_shield.pdfIn PDF document text
    • http://rineset.xyz/73243219713ysyhx.pdfIn PDF document text
    • http://kyponnik.online/35194736408ajli1.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/kifarolita.pdfIn PDF document text
    • http://dalnoboyi.xyz/michael_pollans_food_rules7gj2a.pdfIn PDF document text
    • http://gamedv.design/alexs_office_safe_codey0mwa.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/Eyjikgj/92448516032.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/ruwowetunakevobo.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/gccijhi/66767780244.pdfIn PDF document text
    • http://b4shop.icu/transportation_a_supply_chain_perspective30xik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_64b215e9fbe14186ac749798ea034ec7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23e90e4-f130-4861-9cee-42169d583ab7/statistic_and_probability.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_ae83377299de4342928adb757382dd99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6ae21c-1b63-4dde-9c6c-045a25d2b5c9/72716588378.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_98162349dd994a11a0d43e8e934aa8a8.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_3f2e13c26c124bada072d243d9bdbe93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc3dfa6-b5bf-450c-9c4a-9ecaab47199a/workbook_answer_wordly_wise_3000_book_6_answer_key_free.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_64a595ff26bb42168f0a4fcb1df192cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/128edbbf-0ced-4bb3-9632-76c7f28c22ea/prose_edda_original_text.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_e213f4a2950b4211b3fc9f16dab0b86a.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_cd72af014d444fddb2b48690cd775354.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_b2a605af3a5d4787961fb49f783aa7cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c88f1e9-1a52-42cb-9feb-a0b7ddd6921f/kilebufizupafizesawut.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_8fef673746e7457080ccecd7f5a52c02.pdf?index=trueIn 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 5352 bytes
SHA-256: 865727a1a83a23eb8eb059339283385ef5f77c212a5767d7a01310746462b9f4
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 11008 bytes
SHA-256: 15ef1c646994cfb906373dcd91584a36a35164caaa9dfa3947379ed7a2a5d9c7