Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b940cabc0dbdd0…

MALICIOUS

PDF

81.0 KB Created: 2021-05-18 06:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 67bddcef5a0985eaf307ea2711fb3300 SHA-1: 9aaa6ebb9350f9dd4d13ac96a27d18e3cf0d7d5f SHA-256: a4b940cabc0dbdd0c213476c1aab1ffd5f6ba9d8f528a882e6e71ee3746f1ac4
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 0.9996

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 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://vilenefex.ru/strik?utm_term=cuantos+cm+equivale+1+mm PDF link annotation
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/vazifefewaki.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/viditimilakeb_lawora_vedoni_pezeminiwifemu.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/nosoner_sepamako_tolixobekoli.pdfIn PDF document text
    • https://zoxexakaxikat.weebly.com/uploads/1/3/0/7/130739387/xiwekixu-dogulosisaviner-dovewuzome-lizavixo.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/wukokiwojupelozeku.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/kaduwataxekibu.pdfIn PDF document text
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/8a03449.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/b73607.pdfIn PDF document text
    • https://sewenafefu.weebly.com/uploads/1/3/4/0/134012434/26234.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/1c00e9a9.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/9679515.pdfIn PDF document text
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/fd1db05.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/labakikedodok.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/temitupedadimogu.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/bimivizawukowevexar.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/libusamagowuvo/texas_zip_code_range.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/app_store_free_google.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/sex_and_the_city_season_3_script.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/21349114455.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/70739073859.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/ffx_cloudy_mirror_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 4992 bytes
SHA-256: 7915b7d73d7b057977236dd89230977210691c1b02b643923b5b6994037a5442
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 12608 bytes
SHA-256: d1224a1ae4ea4ffcd3852f4bf82a5eb100725b1a7a7f50d68ef02652ec77a623
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 16100 bytes
SHA-256: 738170ca93733cf3fe8d5d9af6e19279992d3ac9841a882bf61cbfa5b9da7e48

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