Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17ea1584c9ba9ce…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 18:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a90a522c649fe64b3ccd8ade43252f4 SHA-1: b9800ebed434b2ec8e22569dac8332920a39896a SHA-256: e17ea1584c9ba9ceacfcec6f938edf45ceb1706f168e3f9af07dd479b4ca0229
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 0.9999

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://kuzutuzo.ru/award?keyword=bright+futures+pdf PDF link annotation
    • http://xawamiwupajev.mygamesonline.org/carotid_artery_doppler.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/iriahe2/last_pirate_survival_island_adventure_apk_day.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/pride_and_prejudice_full_book_read_online.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/lista_de_antibioticos_de_amplio_espectro.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/how_to_mix_single_stage_auto_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/a5ijexB/xaximusutolagunasusu.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/Kjbkjjx/91256627214.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/kruger_tube_axial_fan_catalogue.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/cjgSAgi/fixing_tiny_holes_in_drywall.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/wovetolufixepi.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/PjaiiOx/tiduforavegebususixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f59ed6-311b-41c8-b20a-b9abb6248626/2008_infiniti_g35_transmission_fluid_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5612d251-365f-42a2-9556-b0b5572dd32a/igloo_portable_countertop_ice_maker_ice102_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363892ed-e3e0-4b20-9f77-2b11c2f660dc/96688335443.pdfIn PDF document text
    • http://girofili.myartsonline.com/what_is_flock_mean.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/loxujukinidonajoxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54092b04-8626-4495-9c77-3d1292fcac76/lippincott_biochemistry_flashcards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4459ae0-83d5-4d4d-a91f-962d1d583cbc/42326796607.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5108 bytes
SHA-256: 5bcb6eaadbfe88a28080ce8275cbc3c51fd15b09594fac3867e9fcae6be89751
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 11776 bytes
SHA-256: f0c45c2266705239d99bc13ef6c433ffb939f3d084e5f52bb1ee4deefc43eb5c

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