Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57962593b6410b0…

MALICIOUS

PDF

69.2 KB Created: 2021-02-11 17:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2c855a017634d76f0824fdc50a85e4c7 SHA-1: 8252d16bf5b3a46a2d8b743e3a24e6c131e5ac84 SHA-256: c57962593b6410b0e3f896bd946372fb1e205b36459312cf7a8b59925efdbf53
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=avent+bottle+warmer+times PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5ff3ce9299821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5fe32f3d3e7ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5fef137cf3d77.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/zoraw.pdfIn PDF document text
    • http://nutunajika.66ghz.com/70875883061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385648/normal_6005b9d42b0a4.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/hihXPhg/dafutm_casino_hot_vegas_slot_machines.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/dedibababoxavomut.pdfIn PDF document text
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/2d7b7a0f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ffd8898c497d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6020b7ce721bd.pdfIn PDF document text
    • https://ratewanevunexem.weebly.com/uploads/1/3/2/6/132681210/2183166.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/9259095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zunebafovako.epizy.com/bali_road_map.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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 5112 bytes
SHA-256: c302a8f513369bb0b373d038fe3eb9b0f490265561dba28a1a2d11dd28081f47
font_01_sfnt_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10296 bytes
SHA-256: 6e9e12fb3fa77bd787842140fffaabad54314f0453bce7e28e62b8692a6a5da5

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