Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab6c9bf688e9ae5…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 05:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 64625a0848d331521e3cbf3962693748 SHA-1: be0a17b5d26fb1437aa24b2c1a39ba20506d606d SHA-256: eab6c9bf688e9ae50f7eefc97622e95e14fb15695a17655057ad897b88557126
144 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 ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The presence of an external URI and a redirector link suggests a phishing attempt, likely to lure users into downloading a malicious payload. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=nsfas+application+form+for+2018+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fad859cccc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5fad5b80c0d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_5fb54d11e42f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_5fb71370b58f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f926f7e39660.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/felizoladizaganulex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5f9573ed29594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5f9ab3ecd1c56.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/8cbc3c3e-922e-4f7f-bd29-b3d9c8d94726/zapukaluruzireluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5e5762-b40c-418b-a38e-b942879aa2df/jurozifuvuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db75d9ac-f530-4d30-b648-e443bfc015f4/88823656347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc042650-0ae7-479e-818e-8bb98a563c72/95354454789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadfb271-52ae-4551-9ff9-18058ee46bcc/google_drive_avengers_age_of_ultron_mp4.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_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 5788 bytes
SHA-256: 9fdd925f19b06aa23eaeb99a8de09afde736244831900eb33713ee30b0e9f027
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 11036 bytes
SHA-256: df43a15febadc7bb098ae5e71993bdcc9ea59899e29d93a6f622dcc135c912e4

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