Malicious PDF — malware analysis report

Static analysis result for SHA-256 2348b037dd258a6b…

MALICIOUS

PDF

71.4 KB Created: 2020-11-22 14:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e8a85567a7c69e9a0e14b83a6379dcef SHA-1: bde9ac5c5ec1bfc94db27fd9fecb7d9297ed447b SHA-256: 2348b037dd258a6ba4c57573c071b508010e97f18ca8fdc2eddf2f717f18c3f6
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-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://trafffi.ru/123?utm_term=corn+allergy+symptoms+in+toddlers PDF link annotation
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/siruzenemukazofotoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_5fa1186c77092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_5fb6b9dec3609.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/bidurudilidujug/ipod_nano_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/94034040166.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/wolinupavasolibumibudug.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/java_array_programs_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/xibuvudebikuraxif.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/focused_antenatal_care_visits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea36122f-3ac9-4b65-a8cc-321f7d4130ff/bastien_piano_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/keto_slim_rx_customer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/pitilelomibagoro.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/78943028017.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/vitumanibokegedoditulo.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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 5288 bytes
SHA-256: de5e062dbe6839513d3a18ba97a0f1ad30922540f9fdecac340155969dfb8b45
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10420 bytes
SHA-256: beeeda99727406747f1d971b8ce8405fecd393f10b1fc2183cdcf117a0155957

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