Malicious PDF — malware analysis report

Static analysis result for SHA-256 906522cb16ca0a45…

MALICIOUS

PDF

79.6 KB Created: 2021-03-06 13:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ca656f2ca4ebcffaa8e90f15315129eb SHA-1: 0c028ade441145749d4cc82d2cb237c448a90f3c SHA-256: 906522cb16ca0a45b20b9de5572395be9a8eb43c4d632eaedf329eedc86e65ee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be a link farm for SEO purposes. ClamAV and ML classifiers indicate this PDF is malicious, likely a phishing or downloader variant. The presence of external links suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=subject+verb+pronoun+antecedent+agreement+worksheets PDF link annotation
    • https://cdn.sqhk.co/leporolino/PNjdvwt/download_game_offline_pc_low_spec.pdfIn PDF document text
    • http://tigimurudel.22web.org/dawukirinuvofixevigili.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/dhghggf/78601419937.pdfIn PDF document text
    • https://cdn.sqhk.co/zelagagunogo/sVIhfge/wofawefudilagural.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/0VVjiHO/download_restaurant_tycoon_cooking_game_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b8d90a-dea1-4009-b630-d8846df037e6/60983314188.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/28301658072.pdfIn PDF document text
    • http://fumojaw.epizy.com/natifulano.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_23f5f99fdf664c5cb20d30966e6caad2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/12464723772.pdfIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/ongc_reports_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/nerijonamufewuje.pdfIn PDF document text
    • http://rowagaparik.rf.gd/blur_photo_editor_software_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55521a5c-418c-4799-9141-ffa7906ebd00/dorian_gray_wiki_fandom.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/7404893600.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/spider_verse_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aa89e7-818c-425e-97fe-0b09df5a5f8e/fantastic_beasts_and_where_to_find_them_2_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbc1576-9503-4a1c-9b50-59702bba3659/zetavexenuj.pdfIn PDF document text
    • http://donolipapaxe.rf.gd/lamofamipopugagerejakexe.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_c53870c4db284304a82bde92d271a7fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6c06f0-d2aa-4ba9-abd4-7a1cd2bad777/ditotaxedotakoramir.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 5992 bytes
SHA-256: 0d5ea23d1a810603173f94c9c73f977acb81c17fca5ba33d2d9a8a43a094d707
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10452 bytes
SHA-256: 5551f91e38c15a1da1626b32b0df437bfa48e273768e2b4c129ee5f8800e961a

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