Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c20214bdfa5814b…

MALICIOUS

PDF

68.1 KB Created: 2020-11-17 00:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 771db79dfa6ec392c5435e27cf41fbdf SHA-1: d3b37843fbc160fd0dc915a7b5e053f860c0a354 SHA-256: 2c20214bdfa5814b2504838e5f0d72ddcb4c31b25e4f387a1f265adf8bc85275
186 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 0.9998

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
  • 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.
  • 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://traffset.ru/123?utm_term=lockn+2020+cancelled PDF link annotation
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/pojowapugop.pdfIn PDF document text
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/wigapusomip.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/ribinukuwuneze.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/tasezekavudosewulo.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/jediragajetu.pdfIn PDF document text
    • https://tiferivirukituk.weebly.com/uploads/1/3/4/4/134433041/9610049.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/jugepuzor-foxugulewozovem-fogewelaninepi-lababusil.pdfIn PDF document text
    • https://bululirujoko.weebly.com/uploads/1/3/4/4/134487270/lunavarisowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5232ef8e-d3f2-4314-bdcd-38a09a8321d4/75065050190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba7ab37-1db4-4974-a3fb-4100ab78acb9/bootstrap_studio_themes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/ict_2020_specimen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa7d768-39cd-4b75-ad90-bde024dbe7c3/poweramp_unlocker_3_build_301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6321b4-f5ba-4397-a8a7-6edd8add4afd/rawos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927eaea8-3480-4cad-a0d5-693eca592a46/86315683114.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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 4936 bytes
SHA-256: 678d9d4bcb48d565e590b0bbcb40c3a447b1a66ffbb43ba62b36c77f02e98ee8
font_01_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 10396 bytes
SHA-256: 324a70f9bdc2250ef3e22583c7b55b8a2f646d83bc387401d7114ea615529a22

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