Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81213ae4b61b91b…

MALICIOUS

PDF

71.7 KB Created: 2021-03-26 08:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d34caa30719607f4d96f363d3e2692 SHA-1: a3d93de51a06208d5814e014adecb65f720ac951 SHA-256: b81213ae4b61b91bc226af0fb81f150847c5925ce1d53081177e91a0e7cf03c9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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
  • 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://resalured.ru/wix?keyword=arithmetic+operations+on+imaginary+numbers+worksheet+answers
    • http://begemotiks.space/health_and_safety_executive_certificate8vp9p.pdf
    • http://timelessdecorum.com/dolukufulufisogilolovomiiyre.pdf
    • http://help-igcopyright.xyz/advanced_accounting_solutions_manual_hamlenug4ni.pdf
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/5f8387b371b.pdf
    • https://tamosumedov.weebly.com/uploads/1/3/4/0/134017363/kazapalotizi-nobabojub-zadaxilabiloda-tamojatixakot.pdf
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/93c93f8bac7.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/062e2054d3.pdf
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/112053.pdf
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/ee771.pdf
    • https://bavifevip.weebly.com/uploads/1/3/6/0/136049805/bepesuvinefunes.pdf
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/5360563.pdf
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/piwon.pdf
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/68a0388b18.pdf
    • http://nncucuucuc.space/netflix_series_away_rotten_tomatoesx2xk2.pdf
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/2635916.pdf
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/6225270.pdf
    • http://turistik-a.ru/gorar2nueu.pdf
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/zoxevowi_dinegesasinax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f84fa02-b707-4edd-8982-efd1ff190d5b/wexejonu.pdf
    • https://uploads.strikinglycdn.com/files/31b487e6-a683-4f24-9a75-60df139efbc9/pebukujemotobudakawinumaj.pdf
    • https://uploads.strikinglycdn.com/files/84c9cdd4-23c6-408c-96c0-8a9b3179fe5d/que_es_taller_de_lectura_y_redaccion_definicion.pdf
    • https://s3.amazonaws.com/rogugagatuf/should_therefore_be_used_at_the_beginning_of_a_sentence.pdf
    • https://s3.amazonaws.com/rowubunak/aspen_plus_user_guide_v8._8.pdf
    • https://uploads.strikinglycdn.com/files/c1bacd70-af2d-4f29-888f-7ed3f2a46c21/xaropifelumifunev.pdf
    • https://s3.amazonaws.com/womirofop/pujadavusedujelopinisode.pdf
    • https://s3.amazonaws.com/xarojapi/24460302935.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_off0000da83.bin
fc927ea39cfe6c2c0e31b48a93767d6aa5ea62e16f48429b9ff5ceee4803cb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 5704 bytes
font_01_sfnt_off0000edd4.bin
e68910737a176f234bcec2c5e2117077780e09c57cf7af5ccaa532b0a58e4ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 10100 bytes

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