Malicious PDF — malware analysis report

Static analysis result for SHA-256 828ba6fcbca48a16…

MALICIOUS

PDF

88.2 KB Created: 2021-03-19 22:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebaa7e12c22385d48f59ac0ec8c6139a SHA-1: d4248a0ff34c9c1a0d178468afed7d88a913b150 SHA-256: 828ba6fcbca48a160e2d9625da290d8b87222c86db67ced89fb79d3f5c178d1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=neonatal+jaundice+approach+pdf
    • http://antonioit.fun/how_to_delete_google_search_history_from_android_phone_permanently0pxf4.pdf
    • http://metazoaapc.fun/video_downloader_for_instagram_apk_inshot_incwbu78.pdf
    • http://esclub.info/446314560044vylj.pdf
    • http://dehydratedoriginalgoodness.com/joseph_prince_youtube_channel37smx.pdf
    • http://neo-tp.ru/roots_prefix_and_suffix_worksheets209oy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_76c5c8c5a4944d90acd67a2358a6950a.pdf?index=true
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_07e2ceb6ee7e4417ad27151a860a9f69.pdf?index=true
    • https://s3.amazonaws.com/bokelur/free_casino_games_no_with_bonuses.pdf
    • https://s3.amazonaws.com/kotodur/rinunepofuxa.pdf
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_e63e6e45c895489982b7b88c25bd23a2.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_07bb099e2309410b963a51fb29a981f3.pdf?index=true
    • https://s3.amazonaws.com/zesotat/warlock_guide_5e_celestial.pdf
    • https://s3.amazonaws.com/voropa/zetavelisusu.pdf
    • https://s3.amazonaws.com/kigavanus/properties_of_rational_numbers_worksheet.pdf
    • https://s3.amazonaws.com/fasudikek/el_corn_en_espaol_completo.pdf
    • https://s3.amazonaws.com/gupojakami/loud_ringtone_for_android_mobile.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/bakrid_movie_video_songs.pdf
    • https://s3.amazonaws.com/jozaponi/85946228680.pdf
    • https://s3.amazonaws.com/tokudapele/github_ubuntu_guide.pdf
    • https://s3.amazonaws.com/sesijesule/los_patitos_feos_boris_cyrulnik_gratis.pdf
    • https://s3.amazonaws.com/penefelomiju/arrma_nero_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fce.bin
aacd1f34c6bebd3d35c38f818f987b09bf326cdd5f656da0aff4b3a38182b61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 4992 bytes
font_01_sfnt_off000120c5.bin
c236fe55b00cd94d3aae728e84dcfe901141666c6064ac9fb7ce501faf2319db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 10756 bytes
font_02_sfnt_off000145b0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145B0 4324 bytes

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