Malicious PDF — malware analysis report

Static analysis result for SHA-256 30aeb04f0b1dec41…

MALICIOUS

PDF

66.2 KB Created: 2021-01-16 12:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a672533fb320b6f95eab84d61b4c154b SHA-1: 79006bd8608af8392e88f16c6461c48cdd7a3027 SHA-256: 30aeb04f0b1dec4131b77f01031ddbe4e407ee77ab9022575fa3117a5d352f66
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The document contains a large number of embedded URLs pointing to disposable hosting, suggesting an attempt to distribute traffic or host malicious content. The primary attack pattern involves leveraging these links to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=the+science+of+zombies+question+worksheet+answers+quizlet In PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/7289125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f8bad25e2c0a.pdfIn PDF document text
    • https://site-1187487.mozfiles.com/files/1187487/clsi_guidelines_mic_breakpoints.pdfIn PDF document text
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/6357399.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/nemudobe_bugifakefuke_pesed_rizovugi.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/4621882.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/5168736.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/9611641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5fef8e9ff2d03.pdfIn PDF document text
    • https://site-1249625.mozfiles.com/files/1249625/beautiful_images_of_nature_free.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_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 5540 bytes
SHA-256: c95264e16f0caacc96eddd1ee7ea182a69dab766990722392984ad0d311e9b2b
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 10360 bytes
SHA-256: 08dc851486f1585ec8227a6693e18b3d0e2e354e98f7496d2a6bc6650bb410fb

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