Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b11e778421bf37a…

MALICIOUS

PDF

72.8 KB Created: 2021-03-14 03:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 77ca7389cbae58d17bd8ba174f4a7267 SHA-1: 07f8d01d5f8a4bf36356f6148f30d489a262e9ca SHA-256: 0b11e778421bf37a8ee72c8f2d2e9df01d4581c95e8c49b1ace8d8b067214270
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure are indicative of a spearphishing attachment, designed to redirect users to potentially harmful websites.

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://kuzutuzo.ru/strik?utm_term=blackmagic+atem+switcher PDF link annotation
    • http://majozugu.iblogger.org/resetear_contador_toner_brother_mfc_7360n.pdfIn PDF document text
    • https://cdn.sqhk.co/dijawagag/hjc54Is/lulizerebaruxubokemuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/Thadxii/grizzly_bushcraft_pocket_knife.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/phdgfoQ/domino_effect_great_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/0geXYQE/another_name_for_janitor_closet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447258/normal_5fd7725d39a54.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/9J4je68/fajir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_60138da2ae5ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5ff39da97e0f3.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/lidimeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_a2f14c9a21e147f38a3136a43658e03b.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_15dce5b562fe4897af402de88e2b0a2d.pdf?index=trueIn PDF document text
    • http://wabelat.epizy.com/isotopes_ions_and_atoms_answer_key.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_58cce093d0b846f2a1d4c04dcd45cf67.pdf?index=trueIn PDF document text
    • http://popofisofol.myartsonline.com/siriusxm_onyx_ez_radio_with_home_kit.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_82367b83e22e4f5b8287669f017a866a.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 5420 bytes
SHA-256: 2d1017169c26dd8741cd352fdbad7dbc36560df832afec61566921ef3fb70635
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 11756 bytes
SHA-256: b143e90fc76fd45f826d2bb38e8dd4e5ab5ab063807aeabf4967ed8a6ab7ee99

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