Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa18cdfe53f8103…

MALICIOUS

PDF

67.4 KB Created: 2021-03-11 19:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fa2ef677a4d18c8374a4f87130bb99c SHA-1: 335b5adb70fcb4166801409b57aee9eb4f4e4c76 SHA-256: 8fa18cdfe53f8103bf477899ae36af2b1c752fa17253c7eef6c60a245ca1c132
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=caflisch+script+font+free PDF link annotation
    • http://jarowulizose.sportsontheweb.net/brother_mfc_j410w_printer_wireless_setup.pdfIn PDF document text
    • http://giocodigital.space/kiwederupusubzj9b.pdfIn PDF document text
    • http://magnitoli-2ekran.site/999752992595u2aw.pdfIn PDF document text
    • http://kavalibosesevu.22web.org/anime_bonjour_koiaji_patisserie_sub_indo.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/subway_surf_hack_download_pc.pdfIn PDF document text
    • http://bloomwithdeanna.com/arithmetic_sequence_worksheet_2_answersfcofj.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/f2cdfdc2-b854-4f06-8225-a4d6cc6b5bb2/rifanodipukub.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_b2ee9cd4b1784fdca653cdcbfed2517b.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_dcc43513ae99406190e10152d5b1f88f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae47dfb9-cef2-4001-b5ef-8d2575102a79/how_many_hours_do_full_time_employees_work.pdfIn PDF document text
    • http://desejole.myartsonline.com/64235981224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5b9728-ebcf-4951-abdc-4526b1ed0b84/33327935052.pdfIn PDF document text
    • http://gapevizatijaba.epizy.com/zudavejinemolanajuboraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbb33a5-1804-4f14-b8a9-cb0a76cafdc0/how_to_change_my_actiontec_router_password.pdfIn PDF document text
    • http://zosonigileg.rf.gd/93338704612.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_8f7425052afd47a9b05802bca1e3cfc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b814055-1b39-4395-b937-c0bf6ef046c2/does_straight_talk_use_verizon_towers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837ba255-a84a-45d9-8aab-311d3d62c043/98363965915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd9cd87-476b-449e-97a0-4a1125925110/microeconomics_paul_krugman_and_robin_wells_worth_publishers_5th_edition_2018.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_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 5008 bytes
SHA-256: a0f6e85154844724340b179ccb4afb088a6529c71d4ab0e5899a6037707b12dc
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10400 bytes
SHA-256: 1f77872d6757a98e982fe4017630d303a768fdc30c1d4ef8bb102d9599ba24b5

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