Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6520fe823ee26f1…

MALICIOUS

PDF

70.4 KB Created: 2021-03-29 17:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7f36dd4eaed62f3e4e66712992df9184 SHA-1: 548efb874be42be673a7bb1b3d974c6c7caf0ed7 SHA-256: c6520fe823ee26f192d01c689df4918d79508c8fdf21865e622926e20ca9374c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=stethoscope+name+tag+id+covers PDF link annotation
    • http://matanusebatug.22web.org/communication_style_colors_test.pdfIn PDF document text
    • http://shopmzm.site/applesauce_calorie_charthb2e0.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/gchghWm/ruponuzakewirafu.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/N3gj8LE/jopolik.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/iasjhfc/vesedepuvipidotelupu.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/RIvvjeC/cash_for_amazon_gift_cards_near_me.pdfIn PDF document text
    • http://rameautbxy.space/lumenupo4lt7l.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/Rjfidgd/43540102761.pdfIn PDF document text
    • http://boldly-grow.com/how_to_get_certified_as_a_nurse_practitionera8ob0.pdfIn PDF document text
    • http://kvadro63.ru/9924909915kdkgq.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/dQhhjit/fijuvibojukaxoku.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/iprhjVO/looper_youtube_background_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenijesadimikig.rf.gd/derorowijuwivexakas.pdfIn PDF document text
    • http://gisipusizen.rf.gd/best_way_to_count_backwards_by_7.pdfIn PDF document text
    • http://miredibe.rf.gd/2019_toyota_camry_xse_v6_0-60.pdfIn PDF document text
    • http://porapasegunan.epizy.com/20218806087.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_f0aff1939d9d41a0ae24e686b590585a.pdf?index=trueIn PDF document text
    • http://fidusigugowubo.epizy.com/egyptian_symbols_and_meanings.pdfIn PDF document text
    • http://novilomarira.rf.gd/biology_reference_books_for_class_10.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_c41bc523268b48709f432e6767b5d2db.pdf?index=trueIn PDF document text
    • http://lafibuwed.rf.gd/tikijusepopi.pdfIn PDF document text
    • http://matowozor.epizy.com/73844446410.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 5620 bytes
SHA-256: 44ac7ef15584600aa5ee69e510155396a3a509de04693a0b7acda021c611731f
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10868 bytes
SHA-256: af50c5d365b584834e836e77f3cd56e00b0f3ca92414170c36701b5d6cf253af

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