Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c12b07318ecfcd…

MALICIOUS

PDF

58.3 KB Created: 2020-11-23 18:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aea6d46fcb68b072a8ec02b7d34c9d98 SHA-1: 22915571343ba66f266bc0eb1fd810041c965c36 SHA-256: 77c12b07318ecfcdab08462f031edcc90790c1f3e9d8c2bc7c5fa3eda59d3513
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 0.9996

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://trafftec.ru/123?utm_term=yellow+bathing+suit+plus+size PDF link annotation
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/jisokogejuzaput_sufarozamij.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/fa246d770637cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5fb7d8cc68927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fa823d556c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f911ebb14b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f89592a69d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fa0fa343c8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f94ac7f2162b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fa553bb879ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8e7122a132f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5fbb48883dcd7.pdfIn PDF document text
    • https://kedixezowudogaj.weebly.com/uploads/1/3/4/6/134618790/fa57e505f01.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_off0000a8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AC 5228 bytes
SHA-256: cbe8b15d39156ae3f61be4e65fad311beb83861496aa4a41a4437fe70cf3c3da
font_01_sfnt_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 10272 bytes
SHA-256: c4a8ffd884558e1b8d04ae5f269552e4a77f79dc054c742050d86d1accd51cc8

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