Malicious PDF — malware analysis report

Static analysis result for SHA-256 430c285de00e0221…

MALICIOUS

PDF

71.7 KB Created: 2020-12-15 01:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bef2fb92917a3a4da62489d70d917985 SHA-1: 9ce0b22117444e135c8c057f326dadb0e3c5aed8 SHA-256: 430c285de00e022107489bb20d285404aa2957f2ce477eea2823630783bb6b3a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing trojan. The high-risk heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the document uses an image lure to redirect users to a URL, identified as 'https://trafftec.ru/strik?utm_term=opposite+of+demisexual'. This URL is the primary IOC, suggesting 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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=opposite+of+demisexual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408709/normal_5fc5aadc92e3d.pdfIn PDF document text
    • https://kigikosofo.weebly.com/uploads/1/3/4/0/134041402/mimilewuxevati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_5fa07dff9cfb7.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/2050118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f92f03ad52a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fb41b4966d96.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/e41980a1-f368-446d-b4a4-ee4f86095e08/49872278074.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/66868952746.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79e65579eee3ae06ed292/t/5fc8bf71ec83506b0481926f/1606991729506/lil_wayne_big_wings_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/nyc_doe_science_scope_and_sequence_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/a_frozen_flower_korean.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56ff268612547ed7c87b1/t/5fc6741d08845d0924697424/1606841374422/pioneer_music_player_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370b53c8-779b-4db0-b582-e31e99f4eb37/87840873082.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 5188 bytes
SHA-256: 75bb2b1f84a6e0a80c9a68583a3b2e35e4607a7c93486981b7ba93715fe26615
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 10144 bytes
SHA-256: 43237cfe79dacd1e7444c4b558eb3b23e5ef72558c3c52e7ac3e5b22a36b1ebe

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