Malicious PDF — malware analysis report

Static analysis result for SHA-256 3609b0c68a290d52…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 00:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c21273f2b92f09919a152d4fde63e58e SHA-1: b814a84641f2c22b9979dbb35f67f28ca5cdf9e2 SHA-256: 3609b0c68a290d52a685ec6c3cc13244200e63ab9506829c29c6d9e8de8b8baf
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 0.9994

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://leonvi.ru/award?keyword=cable+tray+sizing+calculation+pdf PDF link annotation
    • http://simcars.ru/baby_boer_goats_for_sale_in_ohiou8x11.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/water_pollution_ppt_presentation.pdfIn PDF document text
    • http://hdvideo.design/8948084111822qav.pdfIn PDF document text
    • http://podarokinsta365.site/love_dare_for_unmarried_couplest6qrg.pdfIn PDF document text
    • http://dsv-trening.ru/56646787731023fd.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/iso_aperture_shutter_speed_chart.pdfIn PDF document text
    • http://wowitaly.pro/79445832321k23fp.pdfIn PDF document text
    • http://luminar3-download.xyz/how_to_clean_a_crane_ultrasonic_cool_mist_humidifier1nnum.pdfIn PDF document text
    • http://fumigatoff.online/index_of_ebooks_book_chm_zip8q2ue.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/how_to_check_if_im_registered_voter_uk.pdfIn PDF document text
    • http://healthit.space/dopetevubiwexokugifideji5oxhw.pdfIn PDF document text
    • http://evilcheats.fun/radio_germany_radio_fm2c68xo.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/483206391.pdfIn PDF document text
    • http://itanto.space/dalumizomuxesuwpf92h.pdfIn PDF document text
    • http://presalle.xyz/56032765508pryfk.pdfIn PDF document text
    • http://jakor.pro/xoxideluvsslf.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
    • https://uploads.strikinglycdn.com/files/2c652f38-a4a0-45fb-a86b-e9ee34397fcd/xekakupaluzit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103fe922-3968-485d-8fa0-176931bb2702/risukof.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/xuvomoboluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7193a42-d5c3-49db-9c80-024b049b4384/54556948778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be452915-fa78-45d9-b5aa-beb5878801dd/cellular_respiration_lab_results.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5520 bytes
SHA-256: 01cb648b16a4487c4944a623f6b1b630e51d94b2fae1dc28b78d9f8e0b066f30
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10460 bytes
SHA-256: db83fb7cffe0a7fb872eb6d9835ffabb03b37bc2bcb33804727779db4550bfc3
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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