Malicious PDF — malware analysis report

Static analysis result for SHA-256 462676c2f1b70c33…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 21:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0242963d7b0c81072cfe12c77ebd56ec SHA-1: 5dcc8feeea63768f0dadc0a9062cae6650512993 SHA-256: 462676c2f1b70c3367d06369ab6c56a1eba8afd2a9c2f96acfa971baf19236f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that uses a link farm heuristic and contains numerous embedded URLs, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'active listening' which is likely a pretext to disguise the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdn.sqhk.co/rokunufoleti/ib5ikcb/chrome_failed_notification.pdf In PDF document text
    • https://cdn.sqhk.co/kelulegawi/jcxKal1/micro_mechanic_pro_reviews.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/32519960560.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/holt_mcdougal_larson_algebra_2_online_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/fjigdia/vexilar_fl-_8_accessories.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/74451564006.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/84069513964.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/jpgjfgi/android_file_transfer_alternative_os_x.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/gibVKgj/tied_together_with_a_smile_piano_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/iujdQtK/janubi.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/VKIOgfd/38441302810.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/IjffIii/the_cw_channel_spectrum.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/Chegdid/arkanoid_vs_space_invaders_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=what%20is%20the%20definition%20of%20the%20word%20active%20listeningPDF link annotation
    • https://s3.amazonaws.com/sesafefanulokam/gemaraxexipuzukurukisu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/59966119538.pdfIn PDF document text
    • http://xubumanazi.rf.gd/chhattisgarhi_dj_dance_song.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/circular_motion_12th_hsc.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/nuxepo.pdfIn PDF document text
    • http://gurifituzegotu.rf.gd/adrenal_body_type_diet_plan.pdfIn PDF document text
    • http://gogidovegesoxe.epizy.com/meforimemomomexigoxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/the_touryst_pc_gameplay.pdfIn PDF document text
    • http://gazunobopa.epizy.com/relationship_between_radius_and_diameter_worksheet.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/zitudefeterewesodoxoxeko.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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5448 bytes
SHA-256: 595982d56a0387c3c325b78c15b157ced235e2ed50477d1ad0939bdca1e74de5
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 12404 bytes
SHA-256: 8698fdfbe50e06cc48e7eb18596c0e37aae3c54aced8050dba77d0e9862b0f97

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