Malicious PDF — malware analysis report

Static analysis result for SHA-256 397b116754f6ced6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 00:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 086abfa4c8805ab96c4e9fbff565a25d SHA-1: 58e2fe472027e3980ea15fefad1dc9f5b250380f SHA-256: 397b116754f6ced68b51165deb05ce2906b1390ab47974562e338dd573764070
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports this assessment. Although no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=bateria+android+no+carga+al+100 PDF link annotation
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/51205884028.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/33783116975.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/96136237083.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/76114155140.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/14819925370.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90187056267.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dipemudegifalo.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gexenobekuzaf.pdfIn PDF document text
    • https://sapporopools.com/contents/files/54196748143.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a6330280---dirobuxizepukamafitubod.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wozowiferudadarod.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/66427369881.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210908113512843472.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/62630242225.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/potuw.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109130334429828.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/82426618210.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/18524931192.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/4416624998.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/69776916001.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/jadur.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/56807803020.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2916398e6232d53b69ba4b49a926ea7e/gogereri.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nuzinavadelikekunasubu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/deduwewir.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/penataxupopoxibujelebuk.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://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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 10604 bytes
SHA-256: d332a51ed9c6d61113e27241322390af3570d8e531c170847d591fde0d991fd1
font_01_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 18964 bytes
SHA-256: 6664b6c986583ae87c4f397eb33fa0150de85934a6c3482de4183fcd2e0b91b4
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1