Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37d6e8fcb903b49…

MALICIOUS

PDF

71.4 KB Created: 2020-11-11 09:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 842117fea1ca62a0f0eda8920d3b0afa SHA-1: 15bceb54d58e01ebc9ba795d70398e37b3657964 SHA-256: f37d6e8fcb903b499eb97111d772fb646255bd96c79bb16b198e4da6264290c6
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, pointing to various disposable hosting services. This behavior is indicative of SEO manipulation or a phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/strik?keyword=how+did+aristotle+classify+plants+and+animals PDF link annotation
    • https://kunizemofowirux.weebly.com/uploads/1/3/4/3/134311671/jubaxaze_bebesu_dasin_fitati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f96954bcfd96.pdfIn PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/8470a9b.pdfIn PDF document text
    • https://wugemevafiditi.weebly.com/uploads/1/3/4/3/134382928/f77948d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f8e59ecb5bd9.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/xusugoxepa.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/9f050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fa0ffa2dcc69.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/8702c0598e6326b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f95b3aec-0562-470a-aabd-2b6329ae39d2/20128575941.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/sworn_statement_army_adp.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/bhakti_movement_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2ffdb6-43d8-4e67-9307-94ac4e7f26d8/64178214042.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_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 5244 bytes
SHA-256: cd39159abb7a7f95f7abe7c26d1504ffedf4324b85066dad019923972ab1fb97
font_01_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 10932 bytes
SHA-256: ec6cf77840ee8410342592fb1353c4e200a90eca942e6b9790129a83a5564027
font_02_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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