Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc33072000e03c8…

MALICIOUS

PDF

72.9 KB Created: 2020-11-22 13:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1253c58b8fcf84f936b5a3ecd4e5a0a7 SHA-1: eabf43e129fee07a7c5269d7a798a1b35c838c33 SHA-256: 8dc33072000e03c840c9ff2138f498e7d24e351a7c9b1e2682b311e8718b942b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains a lure for a free download, indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. It redirects to the URL 'https://trafftec.ru/123?utm_term=asl+at+work+comprehension+practice+3.1+answers', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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/123?utm_term=asl+at+work+comprehension+practice+3.1+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f9b20cd5599c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fa7082350bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8b626fb560d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f8f7131523f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fb4ded532f39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4b4af79a-ec54-4482-824d-5de243179e82/naferovezuxawuzufifum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d91daa-afbc-4003-9781-7211493929b9/tekken_blood_vengeance_sub_indo_down.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/siwunojuxomidadewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781e5a2e-0634-4743-9405-73e1d07ca4f6/10760528325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb72a8d-9798-4e75-8a4f-d22a4664b2c5/jeduxuxorakepapubowiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa7d455-ef8c-4f50-ae16-ee17c25d68e0/winulekoresezo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 5352 bytes
SHA-256: 9511e6a30d1fd65691022684fefce6b30737e2253a776b515afc2d3c15574587
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10224 bytes
SHA-256: b0415db34b9b5933a7ece92c2068998fcbd6a1daf7a26aed8af6e68b9dbd0406
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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