Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad3a38a165364dd…

MALICIOUS

PDF

116.5 KB Created: 2021-03-08 19:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0df414c209dca95f76f8b6e62a52b1d3 SHA-1: 1106e8711542c0554fa306306c551463db5dc32c SHA-256: aad3a38a165364ddabb9490bc7ef25303d1d85af6bbc542fb9d29b38a47f5b29
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 0.9991

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://zajinet.ru/wix?keyword=letterschool+full+apk PDF link annotation
    • https://cdn.sqhk.co/nuzozuni/cjiuudS/draw_it_out_liniment_for_humans.pdfIn PDF document text
    • http://lnstagramverifycentre.com/darorubifedatejum8rnj.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/5074359.pdfIn PDF document text
    • http://my-favshope.online/dugugofolapitofugika8h60m.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/jalarizovomunek.pdfIn PDF document text
    • http://intereriia.com/wawonanegefadexebijodegoe1jt3.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/rhivgd4/zuzolut.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/viliwimejowarixapizo.pdfIn PDF document text
    • https://juxosejuw.weebly.com/uploads/1/3/4/4/134481686/142a677.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/zobeninupidenunanedo.pdfIn PDF document text
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/196421.pdfIn PDF document text
    • https://bekalerobo.weebly.com/uploads/1/3/5/3/135346313/4441132.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/DicngfL/implosion_never_lose_hope_apk_1._2._12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_c9071c0f342948e1afe0bb5983f456b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/prefix_suffix_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/zaxabuniwubebosek.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/15567438139.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/top_movies_website_name.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/miribopogetogur.pdfIn PDF document text
    • https://a3270cf7-0cad-4945-8928-03ebd18c7466.filesusr.com/ugd/f84671_8876888a6ae54b5a975a1cd30b79b05f.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 7284 bytes
SHA-256: fa956930bae7fe0d2c80209ba466ebe43f3483054f899eb575af38f1ec831a52
font_01_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 5108 bytes
SHA-256: 98de73cee14de7a06014a8ecf93eff755281d75e166dea4e81a8684c3a11b857
font_02_sfnt_off000141ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 15316 bytes
SHA-256: 6e5e82e276b788dbdcbd1a3a7cf270c6dd4ed747965fcb6e5b804da8550db544
font_03_sfnt_off00017301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17301 14836 bytes
SHA-256: e7d962ecb558fc06a39212d6e2ca4c958434aeadd7332c8c77f157ad021593d6
font_04_sfnt_off0001a14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A14D 17064 bytes
SHA-256: abb5888b782f48ad4a1672cbcea7243d82df8c77f020ae46274169e42aaa9301
font_05_sfnt_off0001b9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9FC 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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