Malicious PDF — malware analysis report

Static analysis result for SHA-256 82306173d8d9387a…

MALICIOUS

PDF

79.0 KB Created: 2020-11-11 09:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79afd564f943ccd54e6bbec98b4b375a SHA-1: 63535c63b38c392294fc90c837ea8d4c39388c5a SHA-256: 82306173d8d9387afa2512c1730d847ee685619b2ca9386d0b610265a251ee80
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it contains malicious content. It features a link farm with numerous external PDF links, including one pointing to known malicious redirector infrastructure. The primary purpose appears to be directing users to potentially harmful websites, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=zero+reject+law+idea In PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/2135879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5f9e1a51ea010.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/8337343d.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/wafobab-vexudufoto.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/6501223.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/keneres.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f90391fe2842.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://s3.amazonaws.com/satudifin/pokeporari.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/42423464739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ed1f22-2c2f-4ea9-98c7-081f03347898/60985369405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7b5cab-7a71-458c-84ed-d34d9e75bb9e/gevifedoxivufutu.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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 4564 bytes
SHA-256: 48dcad1eea2a13b53f0876bd9df79bfa9d0f16132747903f8c4e40456c7fe123
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10232 bytes
SHA-256: a3d651406ea900946a70b3cec45eb61192682a18f7ecbcb358744267789609de
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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