Malicious PDF — malware analysis report

Static analysis result for SHA-256 558b6af40b95cb68…

MALICIOUS

PDF

67.4 KB Created: 2021-02-25 03:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 514e80fcb51baa1b1ccdbe36d7b14603 SHA-1: af87078570ef2329868d23031e79a84ff44852d1 SHA-256: 558b6af40b95cb6870cb91633792422015e5999860e6a3e20dc57922c397235b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=ativa+shredder+manual+a10mc18 PDF link annotation
    • http://icub.tech/66948139984e0hp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fcf7ac8dca2a.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/KjcOuee/alabama_football_record_in_national_championship_games.pdfIn PDF document text
    • http://reawont.online/ibn_taymiya_booksa7zkf.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/8700989.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/hjjbnei/fejosufugikovesikene.pdfIn PDF document text
    • http://policyhelpcenter.com/best_video_games_for_11_year_olds_2019m588y.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/jfKhbKY/the_zombies_greatest_hits_song_list.pdfIn PDF document text
    • http://littlenat.space/sources_of_the_making_of_the_west_volume_i_to_1750_peoples_and_cultureslhan1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pusolefosex/lakey_peak_surf_guide.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/bepujaj.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/mikap.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/crazy_craft_modpack_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/dilbar_dilbar_song_dance_performance.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 5388 bytes
SHA-256: 68025435bca1ee36fe1e80adeccb03e22acfef6dba275a8c1884d497846705f2
font_01_sfnt_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 9888 bytes
SHA-256: 964a22caf02193360b6707858cc18001739a89cc49d23fe12ce62e4a9a254f5a
font_02_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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