Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c63dd65658d14e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-15 16:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcfbcf3ce3574ff083c3fc7e0070640 SHA-1: 5d68e1fa425478fe6979c7470e65bf77fa561d4e SHA-256: 59c63dd65658d14e4903a3a7db82019c4f4af2d4630ff87f1916c69129b3b927
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating a large number of external links, with one prominent URL pointing to a site that appears to be a lure for a book search. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs and the PDF structure suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=livro+os+argonautas+do+pac%25C3%25ADfico+ocidental+pdf
    • https://pejolufuti.weebly.com/uploads/1/3/4/0/134018137/napaveletixetaxevu.pdf
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/dazalovu.pdf
    • http://bumawusuka.mypressonline.com/bawajibisewulavumeb.pdf
    • http://tututot.mygamesonline.org/relaxation_breathing_exercises.pdf
    • http://fuxisileza.mywebcommunity.org/geometrical_dimensional_tolerance.pdf
    • http://veselutut.mywebcommunity.org/jesuit_oath_debunked.pdf
    • http://pimifawimonidij.mywebcommunity.org/62885535912.pdf
    • http://lazisirogabidir.mypressonline.com/ramonujes.pdf
    • http://pufivuziviv.mypressonline.com/jogonivakoleloguxeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cebf6296-9a6d-4d75-b028-99d868a0a342/how_does_a_gas_turbine_power_plant_work.pdf
    • https://uploads.strikinglycdn.com/files/9e6227fc-7099-4455-a19a-b47055adbba5/fuxarepobax.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_8d3df86b490a4f1f8f38eba0e2f64eae.pdf?index=true
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d1cbfeb7af304212b6577113be56aac1.pdf?index=true
    • http://kipejefanowisu.atwebpages.com/mujad.pdf
    • https://s3.amazonaws.com/guwutivupudutu/adverbs_of_frequency_song_worksheet.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_be3133cab597440786eb1aa1a341e6c7.pdf?index=true
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_1938437ac2ac424caeb59fa8e489d576.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f61d9ce-c3ed-4f66-9e5e-74150811f32d/55159585369.pdf
    • https://s3.amazonaws.com/xoxaneral/96033859521.pdf
    • https://s3.amazonaws.com/bulujono/technical_writing_and_communication_skills.pdf
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_a96d99f7487f4e1194078ee32992ac72.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_off0000f86c.bin
a2921ac72b74ecdd42b62ed3d9c5ad2be409501d393222f1a2cd106bb5cd3650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 5376 bytes
font_01_sfnt_off00010ad9.bin
7e062fa508056a4a34d7fb76761db5f52b5be041784a1dd5d755fb85e30fa21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 14080 bytes

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