Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2020bf8cb90786…

MALICIOUS

PDF

88.6 KB Created: 2021-03-29 02:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a50db936fef171829640fe36b54cf888 SHA-1: 24255e1bbdd641c1f7283f5f76f9081c5252b46a SHA-256: aa2020bf8cb90786292a65b5aceff7d41cfa3a2f3a985458a9455a97e1e62178
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/wix?keyword=baseball+bat+dimensions PDF link annotation
    • http://kvrovk.xyz/xowatokejok7hug8.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gugetje/ball_pass_3d_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6049b9decf449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fc77bb3b6b30.pdfIn PDF document text
    • http://feedbacrnz.space/how_to_get_journeyman_cardllhnr.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/hkPgcig/48922478677.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600a83a6c6a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5fd9a5902a7f9.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/ajjihQd/20677534896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6039546df12a8.pdfIn PDF document text
    • http://vvinorama.website/megavobusavafuxoja7hqef.pdfIn PDF document text
    • http://minuette.me/mokelademelomediwae4opi.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/fZGyHhc/dijixed.pdfIn PDF document text
    • http://sungo1.space/medicinal_chemistry_jobs_salaryuv756.pdfIn PDF document text
    • http://perevod24-card2card.site/76289600497a1cet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_a42a0ecbdda947309fd2bae30cf05156.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/088a73b5-7603-4090-9d34-21e0d58075cd/milejofe.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_a7f78f673bc44db685ffd22efbac6021.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5ef51f-3bc5-49a5-bb21-227503103976/8312989859.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_8f782d4e95474189be5dd163196f5ba2.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_b3dfce560c3d4e6f80f071e2f23452cb.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_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 5064 bytes
SHA-256: 6ad44b65f6da1365db3daeba1b480895ed25a05926966fd25ae94ea692e72bce
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 12152 bytes
SHA-256: 3b67e203fd32b45f5c1ca5f24facad905ffd841aefdbab17b9012b6d28f6df9e
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90