Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0fe7e61b0cb3f9…

MALICIOUS

PDF

72.9 KB Created: 2020-11-26 06:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2d83a3096fb1bf61f20962f7b5fb4141 SHA-1: ea61d777622ab607f269901196b2fe5e032e9979 SHA-256: 1c0fe7e61b0cb3f95c213af7ec6c3e5cbf34314b8d136c2017f111e3f83d2834
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to other PDF files hosted on disposable domains. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=happiness+is+an+inside+job+pdf In PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/xelefalotagi.pdfIn PDF document text
    • https://xadaxegaku.weebly.com/uploads/1/3/4/4/134444747/lamimogew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f88669f6dc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f963027319ad.pdfIn PDF document text
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/7955206.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/3822180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5f8c58e1a2134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fbd51e304995.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/jaziberev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f969f8f7f659.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/6701395.pdfIn PDF document text
    • https://tatazazotogowe.weebly.com/uploads/1/3/4/6/134618267/4668257.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/gowunose-ritujitaf-juzemisul.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/guvovigo/ray_mabus_nostradamus.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bcia_8706.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 5084 bytes
SHA-256: 3a1cc14137ee5322210a8a2560f33e2fadab14fa8ab9317d7667d5852ad8d86d
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 12144 bytes
SHA-256: 93cbe07c43f55cc2df37a89209dab493e857f20ebf7e27ca64c8757c5e9e4c9e
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16380 bytes
SHA-256: f62a11e082c4e7379818ce26b5843847ae20c32ecbb96a24092dc01cc93a7631

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