Malicious PDF — malware analysis report

Static analysis result for SHA-256 09911da8c02fe0ab…

MALICIOUS

PDF

60.6 KB Created: 2020-11-14 08:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6351f60b11024bda388217d1fb60330d SHA-1: 0c1658863062a79900c660fe25bf2d76d38c481b SHA-256: 09911da8c02fe0abf04e4458e4bc264d40a4ab65a0b5ff909369e6fb53b0469a
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO manipulation to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=exploration+or+reformation+dbq+answers In PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/8d8c40245530e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_5fadabab1b004.pdfIn PDF document text
    • https://jivoxafur.weebly.com/uploads/1/3/4/3/134382284/jagide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f935d6b4d946.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/6451069.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/5e9715c24ea8a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f9f3eadcf420.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/cc60ce86063c.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/868fc36f4ec5867.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/481069.pdfIn PDF document text
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/lomozubenib.pdfIn PDF document text
    • https://vizamonuviwelub.weebly.com/uploads/1/3/4/5/134586337/b164ab0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/58221282153.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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 5572 bytes
SHA-256: 0d0bcb760d6959cc2841ee0be88a11065edb3a8e75f0e08006ba06f47e782d12
font_01_sfnt_off0000c339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 10052 bytes
SHA-256: b2f0ddc05a6144d2e3f939b204872727935af3d30cd406254aa488e4c6ceb4e5

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