Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6844d824460e47…

MALICIOUS

PDF

85.7 KB Created: 2021-05-16 14:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75ea5eae9f8a23107e1f48ee6756b524 SHA-1: f1f08c4c276e4441cadd4cd3f20c99b311d2d853 SHA-256: 8c6844d824460e476ad8132b7ac21aaf2dd698cf2181339a18eec393747bc60d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a Yamaha manual search query, which is likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=yamaha+rx-v573+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417045/normal_605ccc4d3ae87.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/defubakipubekotuwubuk.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/14509096610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcf5e1201215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022ca7261421.pdfIn PDF document text
    • http://welifenepural.iblogger.org/foyle_s_war_series_6_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_60291c16dddca.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/deguzazerazowe.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/045f091c.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/tenubovojezosi_feted_josupefam.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/e363e06e-03b3-4ad3-ac68-1117509f3090/adobe_premiere_pro_cc_classroom_in_a_book_2018_release_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc52790-e8ca-4f8d-aa89-041e2c6aad59/beder.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/kewor.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_1e7561925e8e48b781ef840a8609ef49.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_9c8e10664e404550bcf07b4ce7d8b20b.pdf?index=trueIn PDF document text
    • http://limoxukuk.atwebpages.com/darren_hardy_books_amazon.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/annihilation_of_caste_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f72d6f9-d9ff-4a2f-b360-967d046480c3/how_to_unlock_my_microwave_advantium.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_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 4764 bytes
SHA-256: 64f669facdb324294d76814f8a7ff55a7440ec756c4f61b65dfb3d455949b795
font_01_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 10700 bytes
SHA-256: 0ea05417c5502611a61412a8ae241c42c3d94ea5321f4d011f7e913456244172
font_02_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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