Malicious PDF — malware analysis report

Static analysis result for SHA-256 41eeee590367fae9…

MALICIOUS

PDF

86.9 KB Created: 2021-03-23 04:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14343f148e9462f779bbfcf308ecda30 SHA-1: 1050eff62e4d0da4e2120c7c4e60b893fdc04f37 SHA-256: 41eeee590367fae91e06d3f31e57641498b2552c88e1b2c881030cdf89fda670
156 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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's purpose is to direct users to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=masoretic+text+online
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fe8f49c3b770.pdf
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/bimupizazugin.pdf
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fe56d89508e6.pdf
    • http://lazotub.mywebcommunity.org/1277334620.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6020646e3e027.pdf
    • https://static.s123-cdn-static.com/uploads/4470405/normal_60069edfc8b6f.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/zotelasawavovudov.pdf
    • http://fizebiredasibi.mypressonline.com/99660345820.pdf
    • http://fejavodexata.getenjoyment.net/what_does_gnostic_mean_in_religion.pdf
    • https://cdn-cms.f-static.net/uploads/4530429/normal_6056c8f49ce76.pdf
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/2900165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_99e8154a7bdb4bb0a52e1e598f293c2d.pdf?index=true
    • https://s3.amazonaws.com/gudukupir/fizegopozegejesep.pdf
    • https://s3.amazonaws.com/gedexim/lysogenic_cycle_of_bacteriophage.pdf
    • https://s3.amazonaws.com/novipaliwid/vumejipakajela.pdf
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_059e8c43709b49c7ba6a1043d9bcb8b8.pdf?index=true
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_e9465f34835a4cc8b51b9bfca5440597.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/how_to_fix_audio_delay_on_sound_bar.pdf
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_d9f9fea7e04942be92747bd26ca620b0.pdf?index=true
    • https://s3.amazonaws.com/sefabe/bsg_guidelines_liver_blood_tests.pdf
    • https://s3.amazonaws.com/dazovosugev/anger_crossword_puzzle_answers.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_e49d25a26cfb4c838391f1fa9f87380d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113d0.bin
fbea498b21f3de4c13c6706d52eec377c5d1647a947ec3070a23bfd5538bbe97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 4868 bytes
font_01_sfnt_off00012478.bin
39bf550316e061bfda9570913b4fc3f77deae1b3d74974a80cf4fb1401772d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 11916 bytes

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