Malicious PDF — malware analysis report

Static analysis result for SHA-256 2854d94f8bdb1613…

MALICIOUS

PDF

86.6 KB Created: 2021-06-07 02:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cd3c2e8679598959e10852ef9ad1060 SHA-1: ee44c5230e1a90a6e244e50bd02fd83ac27dd70a SHA-256: 2854d94f8bdb1613b4c748835613634fefbaf18174f1002da1ac3ed809b39247
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/pbw?utm_term=modelo+atomico+de+bohr+para+el+nitrogeno PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366961/normal_60396e5499e25.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450864/normal_60b59b250abff.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/wubuti_petazek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fe102eeb8e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_6003213344c7c.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/xosivida-bagilipifep-guvefora.pdfIn PDF document text
    • https://vifepupu.weebly.com/uploads/1/3/4/8/134886621/7077031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fcbdad2a4e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_60038f57b96bc.pdfIn PDF document text
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/567f0b48f28b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ff0466b52a5c.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/6439261.pdfIn PDF document text
    • https://vekadewozume.weebly.com/uploads/1/3/0/9/130969331/6965797.pdfIn PDF document text
    • https://miwofovewunot.weebly.com/uploads/1/3/4/8/134873206/0517d5926a2ffb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6009cb060d9da.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/002043d48368612.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/8207491.pdfIn PDF document text
    • https://xopekasas.weebly.com/uploads/1/3/4/7/134748476/8934507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_605893ac2710d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5ff8c235ccbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_601b01d8cbec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_6067cb798b73d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 5244 bytes
SHA-256: 3755996b67ae928856bdc5e12aef821119a0d66dee42349db69e03497ade5f62
font_01_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 13936 bytes
SHA-256: b4c5832a32f4de019a0fdc8a346f55b9ac793514c666c819bcc7502e793ba79a
font_02_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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