Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb48806c7c45933…

MALICIOUS

PDF

86.4 KB Created: 2021-04-07 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93877b62df8eaead55c8c965d4cb31a8 SHA-1: 26af8c4c6c9b037e1f7989311382928a5950419f SHA-256: bcb48806c7c45933d837179bb5daae91c5bd1f1d4066ba16028954118a185afc
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 are likely part of an SEO link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=list+of+microsoft+operating+systems+for+computers
    • https://cdn.sqhk.co/badexejos/if42jgP/edit_word_online_for_free.pdf
    • http://uscarins.info/zubalidotinokiwbwb.pdf
    • https://cdn.sqhk.co/savunowudob/dieiiha/carnival_cruise_line_jobs_salary.pdf
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/jovubepuzusesuni.pdf
    • http://revershjtb.site/pdf_to_jpg_converter_high_reskqpdq.pdf
    • http://br1.red/which_is_better_ar_15_or_mini_14h6sau.pdf
    • https://cdn.sqhk.co/joxutedunik/dhgsjjg/3d_puzzle_game_of_thrones_winterfell.pdf
    • http://submonster.xyz/theories_of_motivation_exampleskb1ju.pdf
    • https://cdn.sqhk.co/vukixukafoga/Cihjile/8770659725.pdf
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/magixedebusepu.pdf
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/tawasemeniluzofu.pdf
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/kumabewipos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedufiporara/template_follow_up_letter_after_sending_resume.pdf
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_ad980f92a31543b983ba49241e52be4d.pdf?index=true
    • https://s3.amazonaws.com/satuja/13872054059.pdf
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_4a301986bc674463bf0e432752162ffa.pdf?index=true
    • https://s3.amazonaws.com/wolawatin/fovera.pdf
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_e956068884f34928abbedbf574c92a8e.pdf?index=true
    • https://s3.amazonaws.com/vunizi/mojelekobavufujof.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_9e233c1cf3534327aad0539478f7ce26.pdf?index=true
    • https://s3.amazonaws.com/gulapore/how_to_get_rid_of_behavioral_tics.pdf
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_d8333f01cd5944208a292e92f0884063.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_a6a77af5a37a4cacacebdc4d52d84a78.pdf?index=true
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_76f0cf805d69426caf6c4242e038c99d.pdf?index=true
    • 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_off000111fb.bin
f41ae7c788013414c03d8bb547e2a2123fb90d0cf8a09e363acedce24c483579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 5344 bytes
font_01_sfnt_off00012426.bin
d757d1db3a3a61b7ea131398114a32ab7b3aae8113b9c2a07d2086003afcc005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 11568 bytes

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