Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4165dfb47e895f8…

MALICIOUS

PDF

68.8 KB Created: 2020-12-18 08:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2d30c4996879546b4bdb63a03c0f38d7 SHA-1: 9cef1f4bf9dfe3ae4e40be6aca60c291aee8d9ab SHA-256: c4165dfb47e895f8bb94c89d99abb3e89f4dec3ac0dee1ab0136bb4244d1c3f6
164 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. It uses an urgency-based lure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=dr.+denese+pore+refining+toner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9a6ad6322fb.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/1e911625995f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_5fab9d6523349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5fab6915306c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fc6bbc1b5096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5fbe5d3905ee9.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/kolemuxisiwedar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8aa0822d7fa.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/wupagivoz/linekewosurabifiresid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1962c40-3bc0-40c1-bf2c-4e88eb920a2b/ximekafav.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/61517711053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1908b526-7c19-4652-bded-40b0c0bcdbe8/guvaloxolapuvuzodubupez.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/howards_end_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/femufevudetakagemivisurij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6fb44e-e203-4473-bc8d-2e8072e7d47a/zimupekorufuze.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 4996 bytes
SHA-256: d1797bc8703f50b0b02b7862a2dd20caa0fccb6ce1bf308a6339a31d7eec66a5
font_01_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 10760 bytes
SHA-256: b28c109fa8aef1a367a9fac670b30809ff9e081f9e295f20ae357cb9a2e486c2

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