Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3bd72e8dcdc09…

MALICIOUS

PDF

67.9 KB Created: 2020-12-07 05:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 02c9f2ef2a4fd11d773aabcef727d4d0 SHA-1: 76f30e9ed95c49f3cdfddd9cc395f171fc13c45b SHA-256: c1b3bd72e8dcdc0997ea9959a47bff4be571b7fb2f95f735c43d9af5c7f2b176
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

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://trafffi.ru/123?utm_term=the+mind+of+the+maker PDF link annotation
    • https://dejixujulazefe.weebly.com/uploads/1/3/4/8/134867847/gogatumer.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/5962710.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/mapekip.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/gipowusafumazi-gedogawi.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/dabole_tanodovowujoti_givadegava_natuwojela.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/7939735.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/173347.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/digigitusuduk/pokemon_gen_1_pokedex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2b72bbd740658066ec4/t/5fc5986108845d09244b5987/1606785123828/18690108095.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/lazatevop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf65693f75b16643cd1877/1606378860828/molecular_complete_and_net_ionic_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/expedia_new_york_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/39552116835.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dec85e8e827d42a745e4/t/5fcd75be7ae85b53b2a77808/1607300543193/kibeg.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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 4948 bytes
SHA-256: 0ceca35978b7ee833bd1856851af7ecf05d975ba04ff571210f988edd355bb16
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 10940 bytes
SHA-256: 4eb8341b42bea1332fb4298fd09417f94e53da804553305b51b2f74e1353287c

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