Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53ab57e3857ae2d…

MALICIOUS

PDF

87.4 KB Created: 2021-03-25 05:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cd5c69c638216d63d63feb8f2c79566 SHA-1: 9b80311ce2d8c32bff630e52c9a398bedbe0682c SHA-256: c53ab57e3857ae2de83a68c670f2db2b92da857afb13060723aae959e637fb9c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://soxebez.ru/award?keyword=mathematics+for+economics+and+business+ian+jacques+8th+edition+pdf PDF link annotation
    • http://suvoramitasowiv.22web.org/20391122209.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/dc233d6bd6d69.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/9385a6bd13a3913.pdfIn PDF document text
    • https://jupawipomilat.weebly.com/uploads/1/3/2/7/132741176/bolijeferefuw.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/xepuretamibosapita.pdfIn PDF document text
    • https://mifokidosunatav.weebly.com/uploads/1/3/0/9/130969664/doforemokuval.pdfIn PDF document text
    • http://wssummer.space/712735241788v0xk.pdfIn PDF document text
    • http://mmmmmme.space/685593512780rl5.pdfIn PDF document text
    • http://tk-pobeda.site/mamezofujasusufulexefajade8bo.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/7bd61f1ed72e819.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/a4be9d62d0ab88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa84e276-9fcc-40a9-9bfc-c76d9dd96194/factoring_polynomials_by_grouping_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2361be-8ed1-498b-802e-53e9fcafcfa7/nys_driver_license_expiration_extension.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/active_listening.pdfIn PDF document text
    • http://dewonatazuji.epizy.com/c_programming_basics_in_tamil_free_download.pdfIn PDF document text
    • http://kikevanalujik.rf.gd/wupoloxemumovona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61a17aa-21e3-43f1-8fbd-51f4024a6618/pajajumof.pdfIn PDF document text
    • http://tininababa.rf.gd/68266607025.pdfIn PDF document text
    • http://pujifobekef.epizy.com/nubimapopolid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3757dddb-c01e-49ce-800e-a6b4677b27d4/xuxomatejewusu.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_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 5904 bytes
SHA-256: 7343730b34f937a389f873b1974d987bbd7fa272fa8897782a9f2cb7317d86c7
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 11744 bytes
SHA-256: 92cb5baa721b75096dafb664a2b77a3cb40d7725525fb839bd66e492f73ea241
font_02_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553