Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4e3189ed947f52…

MALICIOUS

PDF

120.9 KB Created: 2021-03-23 04:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7894c8c57a7cdd3830886df7258d8480 SHA-1: 79d516b800676db5a8357b0ff2c32b16d190c562 SHA-256: de4e3189ed947f52beb18016a1bfc4ff2025adfbb9aa72035cca1d0890c759a5
134 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, many hosted on disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, suggests a lure for a 'free download', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/award?keyword=free+download+niv+bible+pdf+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408343/normal_6002473b743af.pdfIn PDF document text
    • http://shtampshop.ru/vesevesedxhliv.pdfIn PDF document text
    • http://misirabul.22web.org/cymera_apk_latest_version.pdfIn PDF document text
    • http://1xbets-regs.site/31353589794v6usu.pdfIn PDF document text
    • http://kushtanash.ru/438025580qgqx1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_6032716e954fe.pdfIn PDF document text
    • http://tertov.xyz/honeywell_th4110d1007_recoveryvmwdr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_604d764ce1d19.pdfIn PDF document text
    • http://tk-time.site/football_strike_multiplayer_soccer_hack_apk6xzwm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fd7d4bad517c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_6016c33083595.pdfIn PDF document text
    • http://znatural.space/tunivifarog3wal6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_601f7454719a5.pdfIn PDF document text
    • http://fb-ig-copyright.com/fcc_testing_reportnvu4p.pdfIn PDF document text
    • http://tiktokhd.design/3710408406388zun.pdfIn PDF document text
    • http://helpcontactform.com/dupalup96l9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5fe9d12fe434e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6040079aa694e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_601d0a92652f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jekogowe.epizy.com/rodizopuvunawid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac433770-9322-40cf-9c5e-9fad30be8e7f/tom_clancy_jack_ryan_books_in_order_to_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b327912-b10d-4560-883d-5bf3533f2eb4/bukidemubomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89a66a8-e470-45bc-8e8e-5ec0ed91ebdf/oxford_dictionary_english_to_gujarati_free_download_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147b04be-209c-4297-a251-2c01297fe087/dibetugikifutujiz.pdfIn PDF document text
    • http://xupewopomiboti.epizy.com/types_of_abnormal_gait_patterns.pdfIn PDF document text
    • http://zufagubiles.epizy.com/31301447951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cfc013-64ae-4459-acdc-3d06df87aa41/what_jojo_characters_are_in_jump_force.pdfIn PDF document text
    • http://sexotuwido.rf.gd/general_computer_knowledge_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DE 5256 bytes
SHA-256: dcf31fbbda97cac4bb4ee08192c1c1d4e05d53ba59ff118544c1e561594da55c
font_01_sfnt_off000195c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195C3 12372 bytes
SHA-256: 054f46353a12d98a66620b6d4d415cf36dfbfdd31ee81865aa2ddbd712a09af9
font_02_sfnt_off0001c028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C028 16164 bytes
SHA-256: ca387c1c3d4f9d2334753a109aee0c02092da34b37e2fbc5f1a997f909c1bf6e