Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67712cb8d57aa48…

MALICIOUS

PDF

92.2 KB Created: 2020-12-03 09:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 22cb61cd93fe49e81cc9c1501f1b367b SHA-1: 9d495722f6fab1536a7ac24b99276ad6e15b9ef5 SHA-256: f67712cb8d57aa48e9ce75dea0ef17e9b2f69099ed53eac354736fde7220d890
156 Risk Score

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 0.9997

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=vietnam+centripetal+forces PDF link annotation
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/7769755.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/6e71658.pdfIn PDF document text
    • https://balogidito.weebly.com/uploads/1/3/4/7/134726556/259545.pdfIn PDF document text
    • https://furasawi.weebly.com/uploads/1/3/4/3/134308809/df3f68599.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/tesapibebujep/bookbinding_stitches.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/72536965718.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/banizawalakewugujazoxux.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/aws_cloud_practitioner_certification_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/29253702357.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/beeswax_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/gb_whatsapp_ios_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/ms_for_man_or_woman.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/lilidezev.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_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 5128 bytes
SHA-256: 97e336c5094a92fb6bfdaf21f8493d8cb4bcace8a9008f3e612a36951351c6bd
font_01_sfnt_off0001406b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406B 10292 bytes
SHA-256: 23ba96cc7f487f6d1fae58cddbe943139dd4a48cfc225feae093e2b9bef96a0b

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