Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec5b0290dcfcd81…

MALICIOUS

PDF

70.2 KB Created: 2021-01-02 16:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f1b63910dd732d2a7e2ca838c98db188 SHA-1: 5fe28ee807b81564b9ee52383ac72962c79d5afd SHA-256: 3ec5b0290dcfcd81ea6e8111c93f61ef2a06ba90bf1a76ab24c6f85375aa05c2
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external links suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall structure and URL findings strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=original+sheila+in+a+chorus+line In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_5fb75f62e035a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fbf3f6c56876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5feb683d73d82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fefe058a31c3.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/bobitukefib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fc916fc7643d.pdfIn PDF document text
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/kisuseju_pezepod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fbf07c978890.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/7613624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5feb82553db9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_5f9c4028e8231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 5088 bytes
SHA-256: 2b310876857ebb21163189a90dcad428db7aecfa0c02060268b206fc39270344
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10460 bytes
SHA-256: 1314d803f3e40fea03ae0e0b9f567bf80fd15a911bfd55bb92abc809df3c5128

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