Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa385f9d591fe049…

MALICIOUS

PDF

84.1 KB Created: 2021-02-12 17:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd8deda996a572c1fae5b6f48ed4ec30 SHA-1: 14ba62c17d8c0a56ebe948b9557ab971f60c56b9 SHA-256: aa385f9d591fe049628c4aa6bff1697ad513506d5dc90e76efcbbfd48f8dac6e
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as downloadable PDFs, indicating a link farm or phishing attempt. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wb?keyword=2%20battery%20saver%20pro%20apk%20free PDF link annotation
    • https://cdn.sqhk.co/noxuluni/hiFgdhd/32724714426.pdfIn PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/1632140.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/ZRjxZhj/learn_html5_and_css3_from_zero.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hR2yXzL/jitiwerovinerukopib.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/UjcIw2F/madness_combat_hank_anime.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/DgfcZI0/jersey_movie_amazon_prime.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/xovin-tavezelipufi-diretizeriw.pdfIn PDF document text
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/f6d55.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/enGjfvn/home_schooling_options_in_virginia.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/ajiAtYt/zolibutorigopaponenuvu.pdfIn PDF document text
    • http://fruit-citrus.space/requiem_skyrim_modtxeug.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/jehexhg/hex_commander_fantasy_heroes_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/bjdhfge/skylanders_giants_wii_portal.pdfIn PDF document text
    • https://vaxurubezinijor.weebly.com/uploads/1/3/4/6/134690270/joxonadikulifubi.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/hbjbg3h/download_tap_tap_punch_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonogopikizezed.rf.gd/auto_click_2._2_apk.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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 5264 bytes
SHA-256: 8f6e21789b7d98b859a724218ca642a391e18d48c4c8de973a3ba9037067686b
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 11440 bytes
SHA-256: 58ea7253734f8e4e3caa98eeb42a91ede413af17ad549f30521e6456b74bca08
font_02_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 16092 bytes
SHA-256: 1a5c434ece748946b6432095f86ed2625df38ec117462ff9300dc90267879a88

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