Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b45bb69664ed41…

MALICIOUS

PDF

70.1 KB Created: 2021-03-09 19:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ccd07d95beb049d1eb44a59981b09c8 SHA-1: 532bcc4c6408c9cf41260342949dd094b265f130 SHA-256: f4b45bb69664ed414a49dafc1fdfdfabbf403538e25087cba6594c6c434735e3
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://dafemum.ru/123?utm_term=the+hollywood+reporter+joker PDF link annotation
    • https://cdn.sqhk.co/totudavomud/0ghidij/2299414404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5fddcdb8e6e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fdc5cb328557.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/idibPhh/luganinefawuzikukesuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_600fa16431c49.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/csWihic/my_dns_server_is_not_responding.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/gcKidlg/20884180857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde76a65e8dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_5fd31361017c7.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/XKRJjjF/high_school_escape_2_level_7.pdfIn PDF document text
    • http://wuduwoguto.22web.org/walt_whitman_bridge_toll_discount.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_1faf6fcf530d48d396f1447b36375d23.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_df8cd40106a44484a6f1c0fe63addcf2.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_1bab69fa48cc431dafe16cc787d1cd41.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_b2c0831ea22c40058b82cbd0000217bd.pdf?index=trueIn PDF document text
    • http://runatavakez.epizy.com/factual_report_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c641b2-f6e5-42a1-a2b9-0b9aa6afcada/tirutozetilamefozezozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99e52c7-ee25-4c93-a7ba-55870104f4c9/55971848872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c568c0-74b5-4b84-be91-06b1234de142/how_to_write_in_google_docs_with_apple_pencil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f3acbe-78dc-4bd2-a3c6-71eca6a9676a/swann_cctv_camera_power_supply.pdfIn PDF document text
    • http://rozavarixiw.epizy.com/kali_linux_hacking_tutorials_2020.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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 4940 bytes
SHA-256: 12efde14b5cc93d834202f587b0885c31f1c7d1dedb735f6f910b9202d889750
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 11076 bytes
SHA-256: c0e433e97e08a69926cb25f057f573048af6948ee9c26f38d1ee525d97bec8a6

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