Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55b58ef8ff3842a…

MALICIOUS

PDF

71.5 KB Created: 2021-01-11 12:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4d59124744072e27ceb71e027c74027d SHA-1: 05cee1173e0fafafaba24cb8e4410ad78dfef1a7 SHA-256: d55b58ef8ff3842a62868a94d9d8c605b8e0303899adb4bdc4c5fa7ae26a536e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it's a phishing lure for a free PDF reader, linking to an external redirector URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL is used to redirect the user to a potentially malicious site, likely for further exploitation or credential harvesting.

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://traffnew.ru/aws?utm_term=best+pdf+reader+and+editor+for+linux PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fd777abaacc0.pdfIn PDF document text
    • https://site-1175549.mozfiles.com/files/1175549/duck_game_free.pdfIn PDF document text
    • https://site-1176739.mozfiles.com/files/1176739/traffic_racer_money_cheat_download.pdfIn PDF document text
    • https://site-1173201.mozfiles.com/files/1173201/century_21_rego_park_optical.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hJgeYgj/93702215749.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/0O2vXAF/cube_crash_deluxe_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_5fe0e9a178f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_5f9af6a794f5e.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/govimusexazuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/77493441959.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/xesugojegisedeziju.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/femapiwajugipisukuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/girl_guides_of_canada_sparks_badges.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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 5152 bytes
SHA-256: da29327e8c83da322b157594ef6de895f44e90e16f4e803fbe4eb256caca2324
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10748 bytes
SHA-256: ac8fa57286e435ee73b8aca37217afa1e8fe1f32b23d9d81c84cbeb42e2fb63d

Open this report in the interactive analyzer, or submit your own file for analysis.