Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f700c7a61d74498…

MALICIOUS

PDF

99.8 KB Created: 2021-02-22 07:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2d8c3f895f905e7e2c227ef59f7d7350 SHA-1: d1d7abd6163ea864ac385a05acdfb2f19a0acb38 SHA-256: 2f700c7a61d7449823453894b68925cd4badb08996b971e9c3ab5e2d36d672f5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure and embedded links suggest it is part of a phishing campaign or a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=interior+and+exterior+angles+of+a+triangle+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_60333b5894618.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/ffb92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_600eafd0d923b.pdfIn PDF document text
    • http://avtoshkola-region26.ru/96776948171vz6pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff8b8ac947b2.pdfIn PDF document text
    • http://detonic-deutschland.website/regoselojuzc5brp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5fee40a6b1941.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fece77d90000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5ff08ebf69aaf.pdfIn PDF document text
    • http://titoto.xyz/619619434411a4pc.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/tojazudibumogab/net_2018_answer_key_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/bapap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 34192 bytes
SHA-256: 2000745c734e300f547cf88072ced39a71b6255bc87ec4af3285ceb32136a373
font_01_sfnt_off00014507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14507 5464 bytes
SHA-256: b545024ac29d573fd1772c4d85b82dce28b2e38babd8de40517a7abdd4323293
font_02_sfnt_off000157b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B6 11988 bytes
SHA-256: bea333c4b439638a5a9ebdc7f17f5a6dbaeafdaa9aaf587f1039223f82f7e1bb

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