Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a78b9d61bfb9f5…

MALICIOUS

PDF

87.4 KB Created: 2020-11-19 17:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 80c3b4d33846df81a90a21db9835e9b0 SHA-1: ee236406a7488cbd80ddb96ced2917c338914409 SHA-256: e3a78b9d61bfb9f5e0d7e251826d18138174635ff23bf228dcccf014d87c7d00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://traffking.ru/aws?utm_term=atrium+innovations+inc+annual+report', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=atrium+innovations+inc+annual+report PDF link annotation
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/fugosirokekan.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/wijoxavu_fawobosugedagas_dogamagavupi.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/6e72cbdd190f.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/jafusulawimudakiwato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9fb08d5240d.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/06d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fadabf0582a2.pdfIn PDF document text
    • https://wanizirutakel.weebly.com/uploads/1/3/4/6/134678241/9658835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f896e1a7b501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87264bd16fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fb5779c25d46.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/mamibis/hidratacion_del_cemento_portland.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_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 5128 bytes
SHA-256: ce9b58be5f29f202e1c18bc76d72803f6e99379a8854b32bb57faa124bbc768a
font_01_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 11888 bytes
SHA-256: bfb18b6b3ca5fa9c61707fac6c486a640dda466f51407c63b6470587407d8062

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