Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b59804d3a7abe1f…

MALICIOUS

PDF

65.1 KB Created: 2020-12-19 00:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 983103174317043807eb29c3788373af SHA-1: dc0194464e5f8fda59d09c052cb11a51a499d04e SHA-256: 9b59804d3a7abe1fa1cc0dc9a6513647f6937af23978ff66a7d866418f961519
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • 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://traffmen.ru/123?utm_term=calling+a+wolf+a+wolf+ebook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fcbe7b0b0b78.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/butajalorola-kisutagum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fd042bd55d7f.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/535129cd-e5c8-440e-91ac-9396d9c41fa3/80361954367.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/xuwetigomize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615ecb21-47c4-4884-a8d8-94a368c0d0e5/standard_enthalpy_of_formation_table.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9d0d74326d1ed153c25b/t/5fdd2c0b15a11837d088577b/1608330252785/bukan_cinta_biasa_siti_nurhalizah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8fa808-47b3-4a93-b386-f5951bf43849/sebakoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3b2a44-b0e6-4481-b65b-5b5aafa11ff1/intermediate_physics_for_medicine_and_biology.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_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 4864 bytes
SHA-256: 7d6d82466bcb5b034d9072b4d72dd3be2afc3112f2cbc57ddadab1ee0c91de2e
font_01_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 10880 bytes
SHA-256: b5aed00942456d08c60f1c7406db289035c3a81daf66dd4051f6a6d9baf13891

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