Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ca3db3f553115e…

MALICIOUS

PDF

83.0 KB Created: 2021-06-06 07:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9fcf9dc4fdb9ff06bdb8113540488b0c SHA-1: 250d8f6248b6f8743bb16c513f91b28e4dd3a3df SHA-256: 90ca3db3f553115e7d33f67cbbf68b6b443f9b6e8fe66893f5b879392cfb9ce8
194 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 hosted on disposable domains, suggesting a link farm designed to lure users into downloading files. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • 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://synerhu.ru/pbw?utm_term=download+god+of+war+ghost+of+sparta+ppsspp+iso+google+drive PDF link annotation
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/9915426.pdfIn PDF document text
    • https://zevejekigo.weebly.com/uploads/1/3/4/3/134374512/39824e0bce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_60634f4fae55c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_6069d95f0d27d.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/wotafaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_60258dcc3dbf2.pdfIn PDF document text
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/2716994.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/xefax_vezarijiwelo_sizatebakifav.pdfIn PDF document text
    • https://vosaxivuminol.weebly.com/uploads/1/3/4/3/134387598/875067.pdfIn PDF document text
    • https://nuzefamulazoxiz.weebly.com/uploads/1/3/4/5/134582777/8411566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_5feb940a26dbe.pdfIn PDF document text
    • https://jetefodakulerur.weebly.com/uploads/1/3/1/4/131453332/wokitarex_pavenakiwu_suvosulodam.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/bajofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369646/normal_5fe0d7acf2e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_6061a39c59c74.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/zoside_lilas_pubudakub.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/duxutodeti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodenapokot.pbworks.com/f/capitulos_de_la_serie_bj_mackey.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144522351/how_many_water_molecules_are_coordinated_in_cuso4.5h2o.pdfIn PDF document text
    • http://tekitejug.pbworks.com/f/download_fast_and_furious_9_sub_indo_mp4_480p.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/unblocked_games_websites_no_flash.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144592413/suzigep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 3244 bytes
SHA-256: ddf78f59f4da2fa33ab663ecca431bbeae034ac5f6197c1d287c86fee2d2573f
font_01_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 5452 bytes
SHA-256: cb896b494d81aae1d5240c2904c115e5f133bffe2ec64677f9f16f10585cd4c0
font_02_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 14496 bytes
SHA-256: 04914abc2333abcdbefd547f90ed1680d8c58f0a81eadf2dba3fdba638b88b90
font_03_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 17420 bytes
SHA-256: 43aa989b77becff574eb234b688e85eb63ca45d933d079312238e89c8ad5f720