Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e3f09dac36f0eb…

MALICIOUS

PDF

101.7 KB Created: 2021-01-08 18:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c40ab0a5ee354a80cb427d0565517d81 SHA-1: b611ead35e9b87b84c76683002dd0af5661c7300 SHA-256: 50e3f09dac36f0eb91378f8abe3969e2676c62df10a8c8fdc6692b7945795ea8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are common in phishing lures and exploit delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=the+addams+family+a+new+musical+comedy+script PDF link annotation
    • https://cdn.sqhk.co/nazopekujavi/hjibieN/botones_sonidos_divertidos.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/Higju0D/50210650405.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/5861732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fc0bc48839f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f9f2bd72bd3c.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/rozebofukixus/92847584056.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/10633714878.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/dungeoneering_guide_runescape.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/28634648832.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/winz_forms_child_care.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/postdoc_cover_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/amlodipine_dosage_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/39735124703.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_off00014b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B94 5540 bytes
SHA-256: 1bc04beb4e28468f8afea0e774964579f118b94ec636eb74ac437a92163858e6
font_01_sfnt_off00015e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E58 13528 bytes
SHA-256: cb759af840cb864fece90a3b1841747c5875d72de676b9f36215bde4742d7587

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