Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66e30b66ae81f60…

MALICIOUS

PDF

73.6 KB Created: 2021-05-08 03:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5930556b43c396c8c5e41d70f7f61cf1 SHA-1: d4763e46826d371db1179ce63b45d081bb69948c SHA-256: a66e30b66ae81f60dfa4f55f3d1ab8a185ab60453de5386a589e2e30a9561dfc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://soxebez.ru/strik?utm_term=dracula+book+online+free PDF link annotation
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/VexuB4N/nikeboziloxorejipiromoj.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/tizeren-nabovedegas-tivape-texaz.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/6680722.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/watermark_mac_os.pdfIn PDF document text
    • https://pudevezogezuk.weebly.com/uploads/1/3/4/5/134528534/8437145.pdfIn PDF document text
    • http://tinubovibiwiwi.iblogger.org/74223266589.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/la_nueva_dieta_anticancer.pdfIn PDF document text
    • http://sagewusibuz.iblogger.org/57725819522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/infectious_disease_guidelines_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/body_parts_worksheet_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/dogville_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/dbx_160_compressor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/countrywide_healthcare_coshh_sheets.pdfIn PDF document text
    • http://tapavakagazu.epizy.com/download_theological_books.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/slope_intercept_form_from_two_points.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/rivavaderer.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/53986606909.pdfIn PDF document text
    • http://lumoripaluwikiw.rf.gd/apetito_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/kenwood_ts-440_operating_manual.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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 4900 bytes
SHA-256: d1bc640376c4cb33f3b27496396a1f7029180ea355ff19b4a02a6329c78f5207
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10516 bytes
SHA-256: 8aa8c0fcd01dc594cdc5c937fe1829976a04c4b7de39388905dc3e0b8dd5c897

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