Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec21e855f88f3a…

MALICIOUS

PDF

83.3 KB Created: 2020-11-17 21:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a61e7dffd5ac3153169f7d573d3a020 SHA-1: dc4af41374384a755a757b4578227b13047f76d1 SHA-256: f4ec21e855f88f3aa859ff95efb6fbd010e4371fa4874e959b1ef5339eed6508
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 0.9997

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=ccie+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375525/normal_5f8dce93439e8.pdfIn PDF document text
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/riwosarabemo.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/fodavovixo.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/kuketew-mugozo.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/xinimafumuvuk.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/ed1f30926d3515.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/makumapikeze/23708778467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcdc87c-8e63-4598-8fcb-39a614a1909b/87674137141.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/basic_english_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50408634-b4e2-4493-8c5a-a46e982a3189/92209145443.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/the_winner_s_curse_thaler.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/chemical_bonding_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/vomiting_pathophysiology.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001231c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1231C 18312 bytes
SHA-256: 42fa6d85614567535c4c97ec52462d18b2738d1d231b78754149d71cf20fcac5
font_00_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 4776 bytes
SHA-256: 46ff8b27c36974f95a30115d08795aa519a40144347cb13f04c925b53178ea79
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 11248 bytes
SHA-256: 6ae70c095533153d691352532ed8b3132e61e0c93a779fa34c69c9cc88765715

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