Malicious PDF — malware analysis report

Static analysis result for SHA-256 55790312c7a7c563…

MALICIOUS

PDF

80.5 KB Created: 2021-03-26 01:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5514e27b15cc1397b699594606e56ab SHA-1: 54ddf9550edbd6e2acfc404ba9918dbdb467e821 SHA-256: 55790312c7a7c563177eb4c62a753ced34dd25f79ac7e5c88d7edec59c402a95
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 0.9991

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/123?utm_term=bollywood+movie+2015++filmywap PDF link annotation
    • https://cdn.sqhk.co/mibemofega/OgfoLid/delete_game_center_ios_14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_60277d275829a.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/masibogudabobiwazimafotap.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/jfW9gdA/74977678429.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/djgKigq/horror_zombie_movies_2019.pdfIn PDF document text
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/gademojali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_603106f118162.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/6Bhcjeh/loopback_audio_macos.pdfIn PDF document text
    • https://cdn.sqhk.co/nixuvaxuw/aSTgdgh/lineage_2_revolution_best_class_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/MYgllhe/equalizer_app_download_free.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/serakabu-jebopuza-witibogilavawup-kesez.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/ieMiiuV/green_neon_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/gRqhigi/bibibewuf.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/suxir.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/LFXXhgx/39324811587.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/wivupaxag.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/juzataluxegozetewidatima.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/28ba1e873fae2cb.pdfIn PDF document text
    • http://picfs.com/18lc9jIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_2cb01623507b4f11af751f0378268e8c.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_4f8c7b006b64451986dddc9498c26aa4.pdf?index=trueIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_d6345d53350c40418466ebc30e03d9e2.pdf?index=trueIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_4688aed1b09949f4a9761b26a812f774.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_ef21e87ebf2f4ceb8ed3ca9ea981bf14.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
    • 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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 5664 bytes
SHA-256: 0291ff00045f4d8c67e06e0da9f8c593974825a7ad43cb6439a534b7696e134b
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 11584 bytes
SHA-256: a690b63ebb745c87664de63296156e9e303d4e08dc8608a03a362515edf3948f
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16076 bytes
SHA-256: 77d0e41b193f2956426f125f137c5665e22c2099967b8d3a504bff5b234847bc