Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bba4d2b06081e6…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 02:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5536af58694b191663568204eea61123 SHA-1: a9ef1d928031aafb78180b03c578d649edb3e250 SHA-256: c6bba4d2b06081e67aee8438dc6e67f1ba838a947058e0de1d8c75705955315c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://garglob.ru/pbw?utm_term=schema+bobinage+moteur+electrique+220v PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426059/normal_60693e224ea47.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/lemuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_60589f6b6beaf.pdfIn PDF document text
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/komekeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_6056c7a16e077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5ff414e8b86c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fd094a5a1cf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fcb1bd62cb7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fdbaeb6ca4ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5ffcbb40043d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5feb87b793f04.pdfIn PDF document text
    • https://nuralizowipu.weebly.com/uploads/1/3/4/6/134693001/5093939.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/1894822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5fee1454539b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_5fd7bfb990ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5fe7508f589eb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417214/normal_60b3d7d714c7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fcd0a9585e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_606d31c63fe6d.pdfIn PDF document text
    • https://sosojisizavawov.weebly.com/uploads/1/3/1/4/131454692/b7502a4c4bc22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5ffc20fa0a36d.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
    • http://tavaretaz.pbworks.com/f/how_to_write_an_introduction_paragraph_examples.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144475134/strong_verbs_worksheet_4th_grade.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/w/file/fetch/144684228/65619203014.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5620 bytes
SHA-256: 96c4691d777e7e4836b33c0ece8a9dcbd36e90157f65dd59b5c484d53ac0f55e
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 11916 bytes
SHA-256: 99ea2603144d2c98448ddd1670727b1ff9cfb9803d31e933dc0517cdfffe72f2
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176