Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59e0f5529f766d6…

MALICIOUS

PDF

88.0 KB Created: 2021-04-24 10:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6170f2171962574da0c5d4afa2c5bc5 SHA-1: c8df172e64fa4481ffd73fc38f8e45080d41575e SHA-256: c59e0f5529f766d6770ce7ad021dfc562432e057786500ebe30e0eb26a8c7772
126 Risk Score

Malware Insights

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

The PDF contains numerous 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 embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://zajinet.ru/strik?utm_term=does+ps3+controller+blink+when+charging PDF link annotation
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/6802913.pdfIn PDF document text
    • http://lastmarkt.ru/formula_para_sacar_volumen_de_prisma_pentagonalub9lw.pdfIn PDF document text
    • http://goodxday.xyz/movojiduxofadarofoq3y.pdfIn PDF document text
    • http://pasendapp.online/detorofawiseritosiviregm4a0x.pdfIn PDF document text
    • http://wowit.pro/philosophically_correct_icivics_answer_keyxcsxt.pdfIn PDF document text
    • http://timelessdecorum.com/do_snowblowers_need_oil_in_gas1d2jz.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/6313e3b4b47.pdfIn PDF document text
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/kemix.pdfIn PDF document text
    • https://valejuti.weebly.com/uploads/1/3/0/7/130739952/e74c22e920.pdfIn PDF document text
    • http://idealicait.website/90960095722y5q90.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/9488873.pdfIn PDF document text
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/fumasuf_serugila_xatotov_jovel.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/7bb439be5.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/libusamagowuvo/93410889960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bb8386-06fb-41b5-bc90-c68b455d3e6e/what_is_the_dirty_version_of_cards_against_humanity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd01656-bfb2-46e8-848a-5fd14ff5f50b/harry_potter_und_der_stein_der_weisen_buch_erscheinungsort.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/kiretutaxasubokuxisaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/toxujivoxojapilesibibix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e35de5c-bfdf-4fc5-9a62-ef8e34316c9b/finding_ultra_cleanse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685afede-2de1-47b0-abc2-af67f7f78c06/rimok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 3080 bytes
SHA-256: 5510861e0701cb7f7f57c1c4f6c9cfe19f8a483cefdede93edc0bf9cc0aea221
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 5656 bytes
SHA-256: bd704c9f0ae0fe6cfaf6b0998079b445038bbc2059049536cece1901979eade9
font_02_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 12424 bytes
SHA-256: c7f79ed367c6bb72d00d888684be5f36708297a20fa206cdc0cd39f27543258d