Malicious PDF — malware analysis report

Static analysis result for SHA-256 4574884b7577e91d…

MALICIOUS

PDF

105.4 KB Created: 2021-04-28 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f5aff0c385cc5c67b508d6539a1b8d SHA-1: 61c58439dad9f70e376ce8966a7783bf81367fc5 SHA-256: 4574884b7577e91d0036470f3d8a3fed8f7126ec2158e75295145102ad08b80f
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dante+alighieri+divine+comedy+book
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/jasawoxatozitoku.pdf
    • http://nutesane.iblogger.org/famigikuvagotive.pdf
    • https://cdn.sqhk.co/bejomewuv/idgchi7/immediate_resignation_letter_template_doc.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/563c615.pdf
    • http://rasezatoxefu.mygamesonline.org/dante_paradiso_canto_12_riassunto.pdf
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/3916356.pdf
    • http://fulosurexexe.22web.org/elizabeth_bennet_marries_mr._darcy_in_the_end.pdf
    • https://cdn.sqhk.co/fuwunikuneg/jhZWiiu/call_of_duty_warzone_xbox_one_download_time.pdf
    • https://cdn.sqhk.co/xenudipu/c4Ce4iX/60019472896.pdf
    • http://dukofinezamidol.22web.org/the_articles_of_confederation_challenges_worksheet_answers.pdf
    • http://fejukoturig.medianewsonline.com/61151747053.pdf
    • https://cdn.sqhk.co/salifera/ajbjcNc/wixapikanepofixaxe.pdf
    • https://cdn.sqhk.co/diruzatojep/bUiigjc/christian_cinema_on_apple_tv.pdf
    • http://vadanunagirira.getenjoyment.net/example_of_job_interview_questions_and_answers.pdf
    • http://poguzozod.sportsontheweb.net/boogie_woogie_piano.pdf
    • https://cdn.sqhk.co/petawelesup/FWggCij/photo_lock_screen_password.pdf
    • https://cdn.sqhk.co/wepunajexiju/9ijjdja/sizezekaguzipowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satawakerexe.atwebpages.com/94598465274.pdf
    • https://s3.amazonaws.com/vovuzize/used_ford_escape_hybrid_for_sale_by_owner.pdf
    • http://jerasopel.epizy.com/11_22_63_clothespin.pdf
    • https://s3.amazonaws.com/muwemivumazulax/sublime_text_code_formatter_json.pdf
    • http://xomedejufe.rf.gd/9900357307.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_off00015965.bin
e085d680246a4cf259cad27ea932496485eee57418f5e29ab2066aa8b957a1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15965 5540 bytes
font_01_sfnt_off00016c22.bin
74529f5496eff36ed007c64f903204d50dcf799be97c316cffc2daea22dfd0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C22 13464 bytes

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