Malicious PDF — malware analysis report

Static analysis result for SHA-256 c089dba76295fa0a…

MALICIOUS

PDF

66.8 KB Created: 2021-01-16 06:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17bfec7535a22ed5ad4ff61e05b80bc3 SHA-1: 75598c22b7caec21f0de3f15f8ea44b76279b9f1 SHA-256: c089dba76295fa0ae9071ef875db435d7e0825be19786cb2def33179aa7d9d29
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=no+david+book+series PDF link annotation
    • https://site-1168194.mozfiles.com/files/1168194/17311565912.pdfIn PDF document text
    • https://site-1173244.mozfiles.com/files/1173244/pixar_lamp_intro.pdfIn PDF document text
    • https://site-1177722.mozfiles.com/files/1177722/poxivimebelogomusibojojim.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/gap_affidavit_format_in_english.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/dixij_pumemetopuzez_dopegadolat.pdfIn PDF document text
    • https://site-1167988.mozfiles.com/files/1167988/steam_link_controller_overlay.pdfIn PDF document text
    • https://site-1234635.mozfiles.com/files/1234635/3d_cartoon_wallpaper_hd.pdfIn PDF document text
    • https://lobekopaxukibo.weebly.com/uploads/1/3/1/4/131453735/1833412.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/wotiwesarozoxe_jubemiduvija_jatanerafigox_jogumupat.pdfIn PDF document text
    • https://site-1178057.mozfiles.com/files/1178057/castle_miner_z_free_full_download_for_pc.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/vovopafubipu/fizasakuwexi.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_off0000c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DD 5020 bytes
SHA-256: 65e0720c20260d4ae287590ca1e7fc757f447511beb74f16827655a7f0d16b9f
font_01_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10524 bytes
SHA-256: b5cc2b4a6207ae02942e7cb2080f9b6fc2529f2bb3e45921bdb106b5a1de8ddf

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