Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e57676dfe50384c…

MALICIOUS

PDF

103.7 KB Created: 2021-03-03 15:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 98bed72cedd3c5ef6c0a5c1f7ce8108e SHA-1: 3f8a3c87a817738e6eed8a090c5b08fb316847cb SHA-256: 2e57676dfe50384c30cd3ff0753dbe399cc424a9973eb64c61500ef9dc9f5c46
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'kuzutuzo.ru'. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Anarchy training schedule', suggesting a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=anarchy+training+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423188/normal_600a4b82872e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_60150ddc82a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_6015eab6c0f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_6024b7f80cbe6.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/5544062.pdfIn PDF document text
    • http://xenuven.22web.org/bumblebee_2018_transformers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_602c2d7014d87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbdef89b2c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_603ecebee8ad8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5fcd766c6fc6d.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/3676781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5fd150f9b84dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5ffc64ef5c5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fc5995090b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_60238850ba09e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fce5878a48d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_600e67cbb517a.pdfIn PDF document text
    • http://vuzuvolumupapiz.22web.org/household_maintenance_list.pdfIn PDF document text
    • http://makikupake.iblogger.org/platformio_esp8266_rtos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fc59fc16ef69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_6026c9807e868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitemefunugege.epizy.com/how_to_buy_currency_in_hdfc_securities.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_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 5292 bytes
SHA-256: 174197db251703ddef3c1885fec4b50a83e43124cf15a65c1a7de5ff29d7d5c6
font_01_sfnt_off000163a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A5 2048 bytes
SHA-256: 5bbfb71e7e79db7713d2dca3d61a529cd6bdf2162d19a91745b024a6fee9cfc1
font_02_sfnt_off00016c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C82 10620 bytes
SHA-256: 1e5c65b62a3ad49c13ddec2cc8bb4b2ceaac132dc566396a2a2c59edccd0b9d2