Malicious PDF — malware analysis report

Static analysis result for SHA-256 317fdca2de8390f2…

MALICIOUS

PDF

64.3 KB Created: 2020-12-08 09:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b650f41106105326438a314f153c27ac SHA-1: e8f3122c5e638e1544d6bfb4ebdebe125d8595ee SHA-256: 317fdca2de8390f2e60ac24401e5be1ded052caf59a78612e55576279625901c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a redirector link, indicating it's designed to lure users to an external URL. The embedded URL, https://traffnew.ru/strik?utm_term=what+does+aqua+affinity+do+on+a+helmet, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=what+does+aqua+affinity+do+on+a+helmet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446765/normal_5fa25edfde8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5f9f6f289eb2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_5fc106e431be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fb5d5b5c31f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f968e1709df3.pdfIn PDF document text
    • https://xilamakiluf.weebly.com/uploads/1/3/4/6/134668497/bugemef_zenewukepos.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/b077d19f-3c96-464f-b7f5-7880c430fa98/43668456707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a13004-693f-497d-9776-ba99b7e21461/gravity_falls_season_1_episode_11.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc292a4e5c7695ca9a65d9d/t/5fc4f7f6173fb5383b3fc4c5/1606744057916/devulatotuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/new_hd_cinema_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/aditya_birla_capital_logo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5608b68612547ed7bdbb0/t/5fcef4b210aae7757164e8c3/1607398579131/nbc_connecticut_weather.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd09b52c6de34c7a3a8b86/1606224313277/91497655598.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58e7fabaecd331841d8f2/t/5fcda1f81e1a4d7de146d813/1607311864573/71695731309.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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 5292 bytes
SHA-256: f064cb027476b91b1ec5552458e6c19cd144f3633156ce5d3114bb8b9af39bf2
font_01_sfnt_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 10248 bytes
SHA-256: bdecb4e96498efe8128125f82678aecebe49099086c644bacd6b320dab901b16

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