Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd0af2314555ea0…

MALICIOUS

PDF

72.1 KB Created: 2020-12-18 11:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 55465792ced93b9b7b1c28a5418ddfb9 SHA-1: 44c2b7a3a8a0d99b113f1984b080e9ac73b8de26 SHA-256: ebd0af2314555ea0e397b9c85c980abce68e62ed3a0c3dc673fb8b79b4cdeab8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=construction+employment+application+form+free'. This, combined with ClamAV detection and ML flagging, strongly suggests a phishing or malware distribution attempt.

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
  • 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://cctraff.ru/aws?utm_term=construction+employment+application+form+free In PDF document text
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/jipotalaweteset.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/0253cb22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f92c2505f2ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fce489c18f3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f921d6-9bf9-4279-9d38-a6da202d2eca/pupapunibagibenunixevolu.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/zumajesobigiwig.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/tropico_6_multiplayer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add49bce-e178-4788-9722-74a8a34be2b2/60431906693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad9306d-a34b-43a4-9acd-991648c11786/25258490253.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/appareil_respiratoire_de_l_homme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db7cd29-7a46-4b77-9b4a-5da11e9a8082/93405910307.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/u2_beautiful_day_lyrics_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/anaconda_movie_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef57772-7959-426e-872e-df80665a414b/acm_citation_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/anatomy_3d_software_free.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5168 bytes
SHA-256: f578f336095498443c2347951339e4cdd844e948fb9e5ac23e4f4e7c5b35a500
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10412 bytes
SHA-256: 3c392f90d811e5b04ca64b9303dec5372f4d78557f528e9eb07dc2363a6c9d2a

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