Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a41a2eb682e2b0…

MALICIOUS

PDF

61.1 KB Created: 2020-11-23 12:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bac8109e1e04a7262751738e64e22101 SHA-1: 193e07f09c157b65f2fde3c3218469d582e72b39 SHA-256: 82a41a2eb682e2b0dd0d10bd6d3a957860d4036769e58fb572843f6e7aa708fb
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=diccionario+practico+de+gramatica+pdf In PDF document text
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/vajiriponubow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5f8dba2cc750e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5fad51912718e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fa454e8e50c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8747a51b911.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/sinadi/number_5_worksheet_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/88275216752.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/cortana_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/40569934507.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/instagram_og_apk.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_off0000aaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF1 5264 bytes
SHA-256: 345cef5188a94478c38c5e1a0b3c6638c589d133e29e1cf1a65127d3e038d551
font_01_sfnt_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 13416 bytes
SHA-256: aad209c6fc70c3863910267f4ace6076644acbe7ac11e79d687e6a1b688d8e18

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