Malicious PDF — malware analysis report

Static analysis result for SHA-256 d519cb03d8f1c88f…

MALICIOUS

PDF

110.6 KB Created: 2021-03-29 20:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 913f560b89d01c7293fe5e4036c57b70 SHA-1: 5acc17f18f1f339d1189b45db71d9bfe159ed9c3 SHA-256: d519cb03d8f1c88f061bb857c36b7492b010c2f347ef36de1a0771774df9cf6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/wix?keyword=ti+nspire+programming+pdf PDF link annotation
    • http://xezixaz.getenjoyment.net/lspdfr_callout_manager_controls.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/dynamic_stretching_for_golf.pdfIn PDF document text
    • https://cdn.sqhk.co/tezabulaw/hjhbieR/prepping_food_buckets.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/labuzizati.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/ie4UCgd/download_zoocraft_animal_family_mod_apk_android_1.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/rekototodejagi.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/90364539646.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/letotomirusipum.pdfIn PDF document text
    • https://cdn.sqhk.co/nesunarimu/S9gfohj/download_game_android_rollercoaster_mania_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://saxodanokijaj.atwebpages.com/43929694041.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/western_new_york_maple_syrup_producers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504c3920-24b9-4b5f-9725-0419ff2ca4ed/best_wing_chun_school.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/79497706509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf729b5c-f051-47d1-af12-ac946a88fad7/rinnai_rur98i_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/blank_acrostic_poem_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a98cd7a-f3ab-4fb1-9502-aad0636f54ec/degelatikolene.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/kezomalupisikalodemarak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5ae4f1-70c1-4032-a6a8-a9b27681d066/90269113932.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645A 4984 bytes
SHA-256: 9d8da5967ef6b489896b3c9aae5e6af485496b0a39ff2ee6535deea31a6bbd44
font_01_sfnt_off00017521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17521 12148 bytes
SHA-256: ad16e614992d6e085be57869886eaa6aafc66ae75a1acfc0f6164e6f8d7085bc
font_02_sfnt_off00019eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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