Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ce0ba9236170b6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 08:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31728635343cabdfb4a876992430b317 SHA-1: 513089ff622bfb2934e3ff092504156323ac25b8 SHA-256: b6ce0ba9236170b6700bac7f5898c4ce5e1472104b468e2dce3d6d79bb3f8d0a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical detection by ClamAV and ML classification. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security controls by encrypting a payload, which is then decrypted using a password provided within the document, though no explicit password instructions were found in the provided document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=definiciones+de+contabilidad+financiera+de+diferentes+autores
    • https://cdn.sqhk.co/numiwufeguv/gfgcjgp/eric_church_new_song_some_of_it_lyrics.pdf
    • https://cdn.sqhk.co/budajawisore/epiijc0/bubble_pop_electric_cake_the_scran_line.pdf
    • https://cdn.sqhk.co/gitovera/fdW54li/forteller_forgotten_circles.pdf
    • https://cdn.sqhk.co/loxinesupiva/4VEgvRm/200685017.pdf
    • https://cdn.sqhk.co/moranunemuk/d7hhggk/23451255996.pdf
    • https://cdn.sqhk.co/vitozogog/3rIIxuu/support_definition_biology.pdf
    • https://cdn.sqhk.co/kulobuwaxegu/gmqjhtH/bonupevimo.pdf
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/wurilekosez.pdf
    • https://cdn.sqhk.co/natokaze/ygfghgf/donation_alert_on_live_stream_application.pdf
    • https://cdn.sqhk.co/xoxujagemo/higcNRj/auxiliary_verb_file.pdf
    • http://tisorojeta.iblogger.org/how_to_clean_kangen_machine_sd501.pdf
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/b2584e2e.pdf
    • https://cdn.sqhk.co/sabeludejem/WIgfge6/mutidudiwesefonapolunupit.pdf
    • https://cdn.sqhk.co/xarazoxege/AHijBuW/chrome_resume_after_network_error.pdf
    • https://cdn.sqhk.co/vopofuxo/jjifJie/veboxabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wofaxil/icse_10th_exam_date_sheet_2019.pdf
    • https://s3.amazonaws.com/najubu/95875691610.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/towob.pdf
    • https://s3.amazonaws.com/xapidajovaji/35353919682.pdf
    • http://wedowif.rf.gd/wazogabawuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea33.bin
5488e68dcbad6fc124cfaa9777c1545065339ed172b475c3f3505290649da985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5156 bytes
font_01_sfnt_off0000fbcc.bin
835f32892c79884a5301ee5e10546fe58f74590459b19e9cc43f623f40a29088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 11584 bytes

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