Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcbde2ca71bb530…

MALICIOUS

PDF

70.2 KB Created: 2021-01-03 04:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 53ff3c32c0f490a057ace6924d853005 SHA-1: c17fe75bf9d1650373b407dc37ff98fafa0970cb SHA-256: 3dcbde2ca71bb530798f36192e2134a1ab9e26a63aaa40884baf67d65adb15f1
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classifier. The embedded URL points to a known malicious redirector, indicating an attempt to lure users to a malicious site. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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://traffking.ru/123?utm_term=cimientos+de+piedra In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fea0d820e8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f88d81838ecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fee8fc9d0c19.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/2P7iblQ/93894655621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fdd2874022af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5f9ebd320f1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fb83a70b9aca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fcec0855772b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_5fc897fd320dc.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/dotivaf/24208800849.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 4976 bytes
SHA-256: a0c0a442acdf50e222d9d921b8979e67b674d011fea3742cdb6a0f39def85731
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 11652 bytes
SHA-256: 62cf470c1240ff6913fa25f493647ce692526d4085b56d0dfd15d212a29cb126

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