Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d88e86f788d9a…

MALICIOUS

PDF

69.6 KB Created: 2020-12-17 07:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 388567210bca4d005dbc769b69aa8772 SHA-1: 7029a5482c1879c55643774ee28da261517ae694 SHA-256: 5f3d88e86f788d9a7ea02f8f34c65bddfd94b511903004631b30159f4f3c0e2b
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate maliciousness, specifically a phishing or trojan variant. Although no scripts were extracted, the presence of external links and the heuristic findings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=wizard+rune+guide+ragnarok+mobile PDF link annotation
    • https://rosuxixenazigi.weebly.com/uploads/1/3/4/6/134656419/2708417.pdfIn PDF document text
    • https://gesinanafu.weebly.com/uploads/1/3/4/4/134481382/a1f280.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/gakigeba.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/dejomeg.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/xonivatafimuru-zakoka.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/98f39c99-a855-46d1-aedf-f15357bff8c2/29496225565.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13aebf7cf8c75402d1f76/t/5fcd337633187724c4fc07e2/1607283574573/luleteminoxubodowekura.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ed69e2fce462bca5ae1b/t/5fd685355488895576b0f8f3/1607894326214/iclick_interactive_asia_group_ltd_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/annual_book_of_astm_standards_2017.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514788ef7301f8b2bec82/t/5fc991a287b36f46d4f7635b/1607045538544/21655450996.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/123_movies_free_online_unblocked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0de27085bf90c0efce9ba/t/5fd0b6f6a4b4ef2db6ac4d54/1607513855148/82625106391.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99fa13a450babf41659/t/5fc52dbb4e98326c02b83ca7/1606757821192/10255080373.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10304b8467722f1d4df02/t/5fc5e4ccf8cdb769c6af7b3e/1606804685172/35279526049.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 5232 bytes
SHA-256: 9f374ef628f1d5621f2267a866b7fae41536e8a3f3d4ecf8ca0ef472d050cb34
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 11152 bytes
SHA-256: 7ae36202fe357cfc3537ce17373b649288754974d4b8dc2fc9f3baec0f844e5a

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