Malicious PDF — malware analysis report

Static analysis result for SHA-256 588c03ac1773b3e3…

MALICIOUS

PDF

82.8 KB Created: 2021-05-24 09:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e097824c7fbdd024f5626688cdfc09b SHA-1: 62c45039f210743d3b9498b33e50ecc6a0df03eb SHA-256: 588c03ac1773b3e3380d58631bcfbe32bcbb9a7b0c05a2aad9f2fdd54710d7fe
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the PDF's structure suggest it is part of a link farm designed to redirect users to potentially harmful content, masquerading as a free software converter. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=autodwg+pdf+to+dwg+converter+registration+code+free PDF link annotation
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/sedulab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fed5a9a2464f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5fc7599df09b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_603766ccf168a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ff1714487c97.pdfIn PDF document text
    • https://dilabugesoko.weebly.com/uploads/1/3/4/6/134627797/lujosaxikajuxob-livamamazanibak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6015abb488dd0.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/3722798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fc90ac230eb7.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/xasojobenifefopo.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/2b3e7ffae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604513a3ddf8f.pdfIn PDF document text
    • https://gudufuremozowa.weebly.com/uploads/1/3/4/4/134403830/wepiwofajatavada.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/palevijuj/47131668426.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/how_many_branches_of_dunkin_donuts_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/vuvazasikepowirex.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/fuzobijuvofenofiri.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/cadastral_information_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/97604990211.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 5432 bytes
SHA-256: 9ac430426ab2b983482eedd8b61a0f4f04ad452cf5fd2cc587affb0ac9b1ff2f
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 10888 bytes
SHA-256: 5a00b8c9b0acad9fb2dd4bd39b1609cf7e5db2b92032adcea9e609a105452a82
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16160 bytes
SHA-256: 5446d8693f472ebe56539db1294e6b993809411a69d567c9d8907fa578c39aa0

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