Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c8cf01b7248a17…

MALICIOUS

PDF

68.4 KB Created: 2021-01-18 03:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ab0206c2eceab72e3076f421febb4dde SHA-1: 796c1952dcf0a23bba09904fed44302231010858 SHA-256: 26c8cf01b7248a179e96f47314c0522d95a7e48bc88964a5fb6e5cf4e515dd23
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to malicious sites. The primary URL, 'https://traffnew.ru/123?utm_term=dell+thinos+8.6+download', is presented as a download for 'Dell thinos 8.6', a likely lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=dell+thinos+8.6+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fba8874a96a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fa835e430d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f95106524aef.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/wawubosimakelog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fa5e1476327e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5fef9e31be2d0.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/gaguxisomi.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/tatutizajefis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5f95bf938405a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f90585906e9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fefcec676fa7.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/satulibaren/65363574393.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/format_python_code_vscode.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/susamemiposudowebujuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/76256055068.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/lofop.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/gajilegonifexorelan.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/tivoposesefi.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/54160704176.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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 5076 bytes
SHA-256: fd02273f10aba1ce7790c072450e21c2b48228c1248f10bc9b9c291d0bb02837
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10488 bytes
SHA-256: 4ac437754c25e7bef41735a7ff5027612445f389df17fdf818ad28ee58ac837f
font_02_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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