Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6266f3bfcca2663…

MALICIOUS

PDF

84.2 KB Created: 2021-05-15 08:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9ac333d58e8482b980594394f0c5392c SHA-1: 2e3b06e4455c8fa13108fc2b2c721b7c67bf5682 SHA-256: b6266f3bfcca2663333f8e1dcb9958aae6a14d3d836035e2b919d7430c57dcbe
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to a 'business proposal', likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=business+proposal+for+video+production+company PDF link annotation
    • http://aycotoro5.xyz/36353552669uimvf.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/ikram_antaki_el_banquete_de_platon.pdfIn PDF document text
    • http://belofakomag.mywebcommunity.org/framed_ink_online.pdfIn PDF document text
    • http://yourdesk.website/what_does_the_bible_say_about_givingkiuru.pdfIn PDF document text
    • http://6gusevshop.space/circe_institute_advent_guide3wdef.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/biotic_and_abiotic_environment.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/unir_dos_adobe.pdfIn PDF document text
    • http://infokurs.design/pawisirerobemomuwarovumc59l.pdfIn PDF document text
    • http://topcreditcheck.info/how_much_does_it_cost_to_start_an_llc_in_florida15bx5.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/how_to_read_and_write_mathematical_proofs.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/todas_las_formulas_de_caida_libre.pdfIn PDF document text
    • http://alkostore.xyz/movurexadakuselilulevmwrph.pdfIn PDF document text
    • http://emirofficialzm.com/figolagozujawutabirudupmgzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabumoligibifa.rf.gd/cataract_classification.pdfIn PDF document text
    • http://zixobotivi.epizy.com/11322348333.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/40596999851.pdfIn PDF document text
    • http://linopiziv.epizy.com/behavioural_science_in_management.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_6459a18657994ead9b24cc473c315f4d.pdf?index=trueIn PDF document text
    • http://resoxivo.epizy.com/zobobukonopi.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_f70ac1e7124a4de5b4f0423974b364cd.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_ead9e6e816304097bccfbe51507ebeca.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 5512 bytes
SHA-256: 7803e2d9d391da0d6c70095421aadc1ade0d9397b928f78292c0e5763531e7da
font_01_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 12112 bytes
SHA-256: 0ff7a5f719210952394b95b107038ab83f45f6df1a77a101fee2f69250c532c2

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