Malicious PDF — malware analysis report

Static analysis result for SHA-256 4917d2e4f35dbeb2…

MALICIOUS

PDF

66.7 KB Created: 2020-11-11 00:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ca44d8ba130767538fe3170dc9e7f6ab SHA-1: 930172725483ffa361d23ec7f3e8dc26a0d39c5f SHA-256: 4917d2e4f35dbeb25cc100abc4d8673eb930e4cfbf59597a0910ddd00eda309c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm detected by heuristics, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used for initial access and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?keyword=dragon+ball+devolution+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f8d9c6d19f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fab0e1ff1eb4.pdfIn PDF document text
    • https://wawotixivawipi.weebly.com/uploads/1/3/4/4/134474061/mufasavas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fab17104e9a5.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/susema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fa650938e098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f937bd3870af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f93cc2472935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8aff4d30887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f9b83aaa40d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fa6a38a4c347.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/juliziwojatige/yfz_450_carburetor_for_sale.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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 5496 bytes
SHA-256: 79241522a83d515064b7f61a3372dbf6011166170b0a8eb989f9230e011afa6d
font_01_sfnt_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 10828 bytes
SHA-256: 3e5aca08c89c6aafbb7f75701ca4cd9658b5598322821d0e09732b9053c58366
font_02_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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