Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c29e99a21d43c…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 15:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4084c2be38c6894cb4d6709cb82badbb SHA-1: b12820de971dce55c05963cfcbbb83024f2c01c0 SHA-256: 4f8c29e99a21d43cd560386b35f6cea4a4810452be475a312dd9cc2ab8a0c91c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming technique. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9123

Heuristics 4

  • 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-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
  • 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/award?keyword=assassin+s+creed+book+1+pdf
    • http://udilische.club/how_to_do_freelance_in_android_development_work18yyz.pdf
    • https://cdn.sqhk.co/vodadavubex/bgcDhfB/ritefifawuveguvuf.pdf
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/fetixekikebe.pdf
    • https://cdn.sqhk.co/worijekegir/peOH9Bn/tamil_album_songs_whatsapp_status_wapwon.pdf
    • https://cdn.sqhk.co/jenojigise/gchaicw/war_khalid_theme_instrumental_ringtone_download.pdf
    • http://prolac.ru/pafinigimwiqrs.pdf
    • http://temipedozut.22web.org/vobujejigesiduvo.pdf
    • https://jojixisobimat.weebly.com/uploads/1/3/4/7/134771177/215c4681.pdf
    • http://kesedepake.22web.org/27029163877.pdf
    • http://arm-watch1.club/galil_parts_for_saleeu29u.pdf
    • http://rosovutuwonemis.iblogger.org/ffxi_drg_guide_2019.pdf
    • http://mirinodok.iblogger.org/just_listen_to_the_rhythm_of_my_heart_lyrics.pdf
    • http://pubguckazan.com/how_do_i_change_the_ringtone_on_my_alcatel_flip_phoneo31w8.pdf
    • https://cdn.sqhk.co/ragejeli/0Pqjeii/pibosegepasifenekete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_10bc3d1a92a14f23a817c2c662215ead.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_040ee1661e7e43f3985a9d72edd1161a.pdf?index=true
    • http://xaxubel.rf.gd/annelids_segmented_worms_worksheet.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_56179e3b39884ab4be25f403e4a07124.pdf?index=true
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_de890f7b1efe4fffb29931b301258067.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_6ac4ebb365ce4dd1b618549eb8f29fc0.pdf?index=true
    • http://kanuximus.rf.gd/dijobixopanopilisokib.pdf
    • http://rujatalunewu.rf.gd/primavera_p6_eppm_free_download.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb6b.bin
b11e9fce7cf2d57efc807f8831e880b2340a20efb9a29b6e64165f76bfaee46f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 5364 bytes
font_01_sfnt_off00010db9.bin
2b64022217848db72689c2174a6f7a69219ea0eb487a127e435819d2858ef240
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 15568 bytes