Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d6e6bfe5de67f1…

MALICIOUS

PDF

65.2 KB Created: 2020-12-17 06:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dc56749eac47902d2cedede8133c5d8b SHA-1: 56155d8dfc38c1107786f98209b9e88d47c1e858 SHA-256: a7d6e6bfe5de67f15c528ba0018d2c225f43f7c8065197abebb6de83b03dc18e
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 0.9998

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://traffking.ru/aws?utm_term=con+calma+video+song++pagalworld PDF link annotation
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/letamarinumojaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f8ee28e99698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f94e82f5c9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fcaca9d23b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f97a86b15f70.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/c2ada412-6c8b-423b-92e2-313e8b83d5b0/fox_tv_schedule_norfolk_va.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0b02c83faa584acdbba3/t/5fd5f80cd654060362bcadd5/1607858189951/java_jre_old_version.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cb0188c99b6d37c032fb/t/5fcb3e12da45e86ccaa06c6b/1607155219155/67308162948.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/navuwufasebudunubejuf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b1f1791da6493f6c03a4/t/5fcce99d5d2e6f3bda3d3f25/1607264670407/56391857492.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50fc0f7cf8c75404597f1/t/5fd6e829dca221526055ccc9/1607919658529/98687625381.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_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 5452 bytes
SHA-256: fdf59ba6fe1f4d51389dc7744d5e0a9cde3f306a0bd624fc6829bd782583c4b8
font_01_sfnt_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 11452 bytes
SHA-256: 644bcfc7a5db4c5f82c39ba623e1ba44da5ec997713203814819f51ca6548782

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