Malicious PDF — malware analysis report

Static analysis result for SHA-256 2057325befc962f1…

MALICIOUS

PDF

68.3 KB Created: 2021-03-29 20:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c504cdc75901a42bda38b399cc86df0 SHA-1: 8ca5b7857a131f8084a6951da4678f265b9517ae SHA-256: 2057325befc962f11ea9049f53c4536dcfc6e34dbde9392949cab3766f4496d1
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 0.9992

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/wix?keyword=72+nombres+de+dios+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/lizuloka/hdIvUgj/pc_games_more_about_space.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/iOvAgho/stomach_ache_and_ibs.pdfIn PDF document text
    • https://cdn.sqhk.co/bulenupulabo/hiowibx/agnus_dei_mozart_coronation_mass.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/33ba2c.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/ij3jfhh/brother_cnc_programming_manual.pdfIn PDF document text
    • https://teliwunamadawab.weebly.com/uploads/1/3/1/3/131381891/vevimuwotaluvuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/2j6TWBL/era_of_celestials_pc_gameplay.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/dc421bd.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/yjaSicE/zirasijalenuvabipas.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/AheBhhx/zonuzijovavogijuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/icgdgiX/wallpaper_hd_4k_backgrounds_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/f7v3tgd/skinseed_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/ifidibt/zojomobufikevagaro.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/demakixanutotote.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/dLji9gf/supuramupusasuvexe.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/5946042.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/hAjiIgd/verowalatonemifipor.pdfIn PDF document text
    • https://dunexagog.weebly.com/uploads/1/3/5/3/135303431/b7edb4fa43e0e3a.pdfIn PDF document text
    • https://gugajonegil.weebly.com/uploads/1/3/0/8/130813642/tinanit_vuguda_gonagu_rijisu.pdfIn PDF document text
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/godutowewepejan-zavajokeliwalo-vixunirubemi.pdfIn PDF document text
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/funaf-xukenugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/3618960270.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/joint_sponsor_affidavit_of_support_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/thanos_infinity_stones_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/29546491991.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 5588 bytes
SHA-256: b1a21250c6e619a13d1b1c1deeaedb2fcb653feb43e8b8a763c6c8215f698b94
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 11220 bytes
SHA-256: 1efa6dc26865ed71fb4d814143d06c2747734b0d61cf0a278979e9a63b647f0b