Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd7b8af6368a449…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 19:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7143143d2e1056ba71ae7237d4d3e99d SHA-1: 1cd7be46a6a0b27502e606f282d5b2be8a7c24a5 SHA-256: bcd7b8af6368a449e7caafd2445453320d508df2a1aee3c04a6edb86c2cd92c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=amar+o+depender+de+walter+riso+pdf+libro+completo PDF link annotation
    • http://medolufinumul.sportsontheweb.net/38897602498.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/2ded8.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/9311745.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/dofezirefepadul_mobefodisa_pewibo.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/certificates_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/rThf9id/border_officer_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/gejjigD/small_business_management_chapter_7_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/Tgpiaie/jewel_star_2_apk.pdfIn PDF document text
    • https://daxosunusopudom.weebly.com/uploads/1/3/4/5/134510034/521f7aae.pdfIn PDF document text
    • https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/xazumenupifovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/texas_instruments_nspire_cx_software_download.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_328278d22f5b4271ad4b0b0326bef769.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/49709975866.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ec7d1c3733524ffd82d01d5212757054.pdf?index=trueIn PDF document text
    • http://kivarutumo.myartsonline.com/aspasia_de_mileto.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_79f8d80fee9f4c3db95c32f691f238f8.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_e6103aecf1d049fe97d9fa546bbc0284.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_a02337ffc4e14dbfa424a535be644dfd.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_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 5520 bytes
SHA-256: 35d935d4cdb2259a8a713003b409e18237617e0bc0a0d464ce325f93564cf302
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 11732 bytes
SHA-256: 8de6fc081b4b4439b76aab072bffd8b9d47b448ea32280cd932d6f554adbbdfd

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