Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bcead3588bd7ba…

MALICIOUS

PDF

92.9 KB Created: 2021-03-22 23:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 014121f8c4e51e21d0a7255cbf0096c7 SHA-1: dc0f4757f62cb0688e71298e705de1ba21d8b2bf SHA-256: d3bcead3588bd7baa6430a411c52964d5135695ef3f597295dcf649b544e44b9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://xajibur.ru/strik?utm_term=how+to+make+a+powerpoint+for+an+interview PDF link annotation
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/3230854.pdfIn PDF document text
    • http://jushq.pro/final_fantasy_xv_pocket_edition_hd_ps4_reviewvafa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6008d0e9550b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd913f8d8173.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/kafubopul_gigojodotizi_vapit.pdfIn PDF document text
    • http://repair-telefonov.ru/rizisujadubenepixanixam46env.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ff86fbc1f24e.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/dezuxefedat.pdfIn PDF document text
    • http://petrol-v-pol-price.site/rules_of_attraction_movie_ending_explained52tzb.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/RXYhejh/sports_apparel_wholesale_suppliers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_6031581d897f6.pdfIn PDF document text
    • https://tobakegerikudo.weebly.com/uploads/1/3/1/4/131482881/c983990.pdfIn PDF document text
    • http://callipakk2.site/24399669063dw3hc.pdfIn PDF document text
    • http://proba7.xyz/drastic_3ds_emulator_apk_ios5qs26.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/LZ7QjjE/commodity_prices_livestock.pdfIn PDF document text
    • http://wisitens.online/11303791418sjwng.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://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_18f3cf07158f4217a09f7b598d19e89b.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_016191aeccfe41be95beaa9592eaf490.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_465b7b1870ae4f809d5072783c5feefa.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_d0c0ed7a446b4cab963b2d9f1b9c47a8.pdf?index=trueIn 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_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 4804 bytes
SHA-256: 71b265d97dad7db85a8a53dcb930e415d24c4a1bc996fd967206b6706b2865ab
font_01_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 10900 bytes
SHA-256: 2e6742f19cb4b3202bd20f1928bc8a6bc8d4d4755bfb0f94ed5b565bfafda01c
font_02_sfnt_off000157d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333