Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7cc40448834e2f…

MALICIOUS

PDF

82.6 KB Created: 2021-02-04 07:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ca4ca9dc8b234398bbb31d910e57840 SHA-1: 413133b2a853beb07eb06ded04d0891841de3c07 SHA-256: 7e7cc40448834e2f7a0c86887ea57d6021104909523ab142f1296114bda490ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier scoring it as highly malicious. The document contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a potential phishing or malware distribution attempt, possibly leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=baby+boy+images+hd+free
    • https://cdn.sqhk.co/remimidotomi/ijigdWt/nostalgia_electrics_microwave_oven_in_aqua.pdf
    • http://koreanluxe.com/download_game_dead_rain2_tree_virus_mod_apk0w2hu.pdf
    • http://storeyou.store/juxelegigapitumi1o64m.pdf
    • http://portkamesto.site/552450642605iup6.pdf
    • https://cdn.sqhk.co/mujekesire/gihjchc/78683412175.pdf
    • https://cdn.sqhk.co/demawanetufi/hiKgegh/wehrmacht_meaning_word.pdf
    • https://cdn.sqhk.co/kixituvelil/jjdheUF/dapibivikafowadibunal.pdf
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/1065314.pdf
    • https://cdn.sqhk.co/zodenizekija/gciliah/youtube_tv_nfl_games_tomorrow.pdf
    • https://cdn.sqhk.co/sesexibanobu/hejaIgf/siriusxm_music_podcasts_radio_news_more.pdf
    • https://cdn.sqhk.co/bojidokagivi/jd1hc7t/sazifidapolukuriwob.pdf
    • https://cdn.sqhk.co/nuvuvidova/eIcjb2T/zadugusatixajonidakezuvab.pdf
    • http://alexsaf.ru/92721611122z55of.pdf
    • https://cdn.sqhk.co/xivovido/jghbgj9/vagijadufasini.pdf
    • http://siteznakomstv69.space/warhammer_40000_inquisitor_martyr_crok9gq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumomasugipeno/83067256432.pdf
    • https://s3.amazonaws.com/xirixepo/ginebra_san_miguel_inc_annual_report.pdf
    • https://s3.amazonaws.com/paropabaru/63744705245.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001066e.bin
2fc6551cacf6689c61d02629d7708d4947fbb9d69cda38e1e1cfb1d09afce104
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 5580 bytes
font_01_sfnt_off00011948.bin
c652982d73d9b5a8be14901c3ab4de29c2d1d9eb31d26e5f5c287d1f96d19985
pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10628 bytes