Malicious PDF — malware analysis report

Static analysis result for SHA-256 c406bb0d168fa083…

MALICIOUS

PDF

59.3 KB Created: 2020-11-19 19:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f41d3ac2e43c4b137e2eb1072fe4f9ab SHA-1: 97e65e588d6e2fd4a388ead673249ec4a7a359d6 SHA-256: c406bb0d168fa0832790487723ebb7feb7652e43710837b51fad99392ba21ea1
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=longman+preparation+course+for+the+t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8fb6b3bc0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fa297814e0a8.pdfIn PDF document text
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/disuzarilanikap-vanuketibux-sufezapodi.pdfIn PDF document text
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/tinizonalajobomip.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/f94f2c8dee18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fb35b3844fc7.pdfIn PDF document text
    • https://xatufatug.weebly.com/uploads/1/3/4/5/134597760/fomibutinevalakixen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5faf69bd73fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fafb5ad436e0.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/466ca8e2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f95e7ff28504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66cc155c-9e3d-4223-9fc5-2cbc62db0ba0/88667477620.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_off0000ab59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB59 5336 bytes
SHA-256: 01cf241485a61ee2b3cdef582cbb64b4f0a407e904c2682f89d33d1d7a251a1f
font_01_sfnt_off0000bd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5F 10288 bytes
SHA-256: 02eba6ac8839eef043a293bc8a092a84780562f471d0ee96b2652fa62300add9