Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a47017875fc5de4…

MALICIOUS

PDF

77.8 KB Created: 2021-05-27 20:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4544e6132376d41f8db0e33161d19d68 SHA-1: b12ffc491b728d83dbd099c122439d5b46649311 SHA-256: 3a47017875fc5de45aa8e4f74d583aa9aff7e5158c410c138d1a3e06e4871d30
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://baarspo.ru/strik?utm_term=what+causes+false+positive+pregnancy+blood+tests' indicates a potential phishing lure related to health information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+causes+false+positive+pregnancy+blood+tests PDF link annotation
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/mafitiguperixet-fovegi-fuzojiborekus.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/730575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_6035c3a5ccfc2.pdfIn PDF document text
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/rijuwisoliraxowu.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/lugolobiro_zepexanew_buvekafokawuw_xolafabesex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5ff69b2c9ce62.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/9573309.pdfIn PDF document text
    • https://xirugavo.weebly.com/uploads/1/3/4/3/134337246/6025010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5ff4129ee2aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_60532065b9b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6064fc3ca2211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_60609b13bd222.pdfIn PDF document text
    • https://vuxanuvawemot.weebly.com/uploads/1/3/4/7/134719342/8489363.pdfIn PDF document text
    • https://kiparefewegapip.weebly.com/uploads/1/3/2/6/132682538/bbe5b55f1cf28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_600e41e0a32c8.pdfIn PDF document text
    • https://betutinixe.weebly.com/uploads/1/3/4/4/134481053/kuzusipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_6041496ccdda6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9797a0bf-58d8-4e81-a4b6-9235403a053a/sapiens_a_brief_history_of_humankind_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c22693-fde0-43f7-961a-552d182859f2/73991576249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67db2a9-a2b0-444d-870e-e4b6ad093c2e/49703953853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a093a2-2762-4947-b5dc-c370b132b229/45581365168.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 5732 bytes
SHA-256: c748b4d461619ea5e2183f47217e4ae4f8fb3ba11d04f5b913cf4f834d51aa34
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 10292 bytes
SHA-256: b5bd8e4c16b6f30aa9345110c9d55d4fd81f076846ab205064d0f077fb87e5f3