Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc221c118c5200c8…

MALICIOUS

PDF

179.5 KB Created: 2021-05-16 14:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584c77bf2bd393e4d4aec4e4d7d81a76 SHA-1: 23eef38502e33e39a01b03140f137d10ae8685e6 SHA-256: bc221c118c5200c873efc4079744e4475f46f1d083d0b62f70b6de03806aabf4
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI, pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of an external URL suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=hunchback+of+notre+dame+book+3+summary
    • https://cdn.sqhk.co/kumotuxijufu/jdRrhhY/hidden_object_games_free_without_downloads.pdf
    • http://rulitapalesu.iblogger.org/boosting_algorithm.pdf
    • http://xafopawiki.medianewsonline.com/fufepujapedupibufewebo.pdf
    • https://cdn.sqhk.co/silutoge/DpgdCph/word_trip_level_206.pdf
    • http://kejoxemubogese.mywebcommunity.org/tibet_life_and_death_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kisalonokexiwi.atwebpages.com/litar.pdf
    • http://bagurofodi.epizy.com/eular_guidelines_large_vessel_vasculitis.pdf
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_d0e6c2bc29cc40bc8553c26e0f9380b3.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d13feb17ec8f4c2fb380d990f1592d2b.pdf?index=true
    • http://fufudaloxola.onlinewebshop.net/antigeno_helicobacter_pylori_en_heces.pdf
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_074665f517a74dc99426a1c3aa6892f6.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_ed349705c989471296354629ffb315f7.pdf?index=true
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_2312b88daec54f38954f53908937df5f.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_f2fb9cb8c2694bf19118adf4175c62a8.pdf?index=true
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_ab72620b64d34d8bb4f88b7872a3dcc6.pdf?index=true
    • http://ziresam.rf.gd/68468058753.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_off0002824e.bin
6c4641f2dbaa8e01f3bf624f41cb07784581c31675f19bcbd4f63be7aa1c3732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2824E 5660 bytes
font_01_sfnt_off00029569.bin
6911c9d14be71bf95ea70a9a85c644158127cae4570722cf13db1600b10529fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29569 13748 bytes

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