Malicious PDF — malware analysis report

Static analysis result for SHA-256 5319c66513c0ce71…

MALICIOUS

PDF

71.6 KB Created: 2021-04-25 16:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15f3d74f95067b0d012915f5e390104c SHA-1: 749b4d755d20f937d8dd1a3cd1e31aac050b2633 SHA-256: 5319c66513c0ce71a1febe799307d32833bd691a468458cbd25838f67bf98aa9
126 Risk Score

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 0.9989

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://crophysi.ru/strik?utm_term=how+to+train+your+dragon+plush+toys+light+fury PDF link annotation
    • http://oyuncuxx.com/kudox_electronic_heating_element_controller_manual895tw.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/zilikoputuf.pdfIn PDF document text
    • http://mon-cmbretagne.best/best_wireless_bluetooth_for_androidj3xkj.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/38ja5ha/tower_defense_simulator_twitter_codes.pdfIn PDF document text
    • https://binaxurekise.weebly.com/uploads/1/3/1/3/131381555/2683113ab.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/4430b79a15e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/eJs5gjp/jomebum.pdfIn PDF document text
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/ruxivujasal.pdfIn PDF document text
    • http://akvatehnika74.ru/kesemokakodkpva4.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/TKjhgg4/fallout_wasteland_warfare_game_review.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/607af.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/iivgheR/xowasifex.pdfIn PDF document text
    • http://pro-konditer.com/estudio_del_trabajo_1gzssi.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/N8yjar7/pelakubikenilikojujako.pdfIn PDF document text
    • http://shop.universIn 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/af6b78a2-541c-497d-b853-da6100ab556c/how_to_replace_timing_belt_honda_civic_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871e6ff7-995e-4ba0-9ab0-7567957b3918/harman_p68_pellet_stove_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1e4377-e691-4c72-850d-026842d53858/66874749163.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/76682928052.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/loan_agreement_template_word_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/56709404415.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_b6ce78a94b3a4bf784d46e7654aa1098.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/99929683117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fac17a7-a21b-457e-b1f7-b80e1869dc12/how_big_is_a_crossfit_tire.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_44bae4e503ec4af49cb08158de085d7c.pdf?index=trueIn 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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 5220 bytes
SHA-256: 1eccb73fcd262ce573d5d549740aea8271f2c2808030665534105f5bc99c16fc
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10832 bytes
SHA-256: 3a48a0b0a274266672fb09905cf6cf88cebf44fb0ee7d0bd24d069e8802dd404
font_02_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e