Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcb9ffd26b2a542…

MALICIOUS

PDF

68.3 KB Created: 2020-12-23 17:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 258bc870077f1f443b3aba68e2dc9482 SHA-1: d2a8532cdf8c6c8554ee3e18e074981f7bc7bfda SHA-256: 1dcb9ffd26b2a5427df51341a36577f948f80b7161f75d4023d9ca03f47952b4
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a large number of embedded links, with critical heuristics indicating it's a malicious redirector link and part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to phishing or malware distribution sites, and the document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/aws?utm_term=cribriform+plate+function+bone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8bdb6e57471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcbf28380c14.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/7305847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f87304b89c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fa0a50cc6bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5faeab70afd71.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/c3b01f7f-eb29-45dd-940b-095630ce19be/67127664793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97710c06-a791-44d8-a369-766fd2c8ad4b/70110208693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc05db0-2534-4359-8f05-9680812401cc/smackdown_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/similar_triangles_word_problem_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23807044-a4ca-46e6-bcfa-7a7fb019d490/skeeter_boat_center_used_boats.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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 5028 bytes
SHA-256: 583768c850f6db411f8ac78657c62db51c3aea3a5b9c183b20eaaa71ecacc54a
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 10604 bytes
SHA-256: 068bd2aa3ceea48ca802c06ae5470374f6f5df1a5a5332b00e886c94c845853a

Open this report in the interactive analyzer, or submit your own file for analysis.