Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e588d7474912785…

MALICIOUS

PDF

77.9 KB Created: 2021-02-21 06:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c5720f6b2534bed326f59f8d296a56fb SHA-1: 0628e66ab988040dbf7b9a69a9e5adcfd1148a52 SHA-256: 9e588d7474912785900dab4df5f05ebc792721ee60367e2317d2e4b3b795db62
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains or services like Weebly. This behavior is characteristic of SEO link farms or phishing campaigns designed to distribute malicious content or manipulate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=regular+and+irregular+verbs+list+english-spanish In PDF document text
    • https://bireguvax.weebly.com/uploads/1/3/0/7/130775683/dodesubef.pdfIn PDF document text
    • https://lajidusok.weebly.com/uploads/1/3/1/0/131070852/1188463.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/7287103.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/1b1c38b823.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4a22e63ae505250.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/a7666.pdfIn PDF document text
    • https://sovivagigeb.weebly.com/uploads/1/3/5/2/135296454/gomafalexux.pdfIn PDF document text
    • http://josebixotarez.22web.org/fezoxenazarizururader.pdfIn PDF document text
    • http://ziwefewixus.iblogger.org/lipid_guidelines_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagamifex.epizy.com/18876314963.pdfIn PDF document text
    • http://polexunew.epizy.com/68761885169.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/momikipejuju.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/star_wars_battlefront_iii_legacy_mod.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/20739474053.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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 5460 bytes
SHA-256: 41e0ea9bc6d55afdcb7de2e4aa10b20e44cd1077b6a93191bad7f7d56216e3a0
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10476 bytes
SHA-256: a7fff6437f8db2c5a30bec124d89905369b5178f6a1488ba9e2a4bb5b60749df

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