Malicious PDF — malware analysis report

Static analysis result for SHA-256 71471e79b9c81280…

MALICIOUS

PDF

70.8 KB Created: 2021-02-28 10:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 91ea302de1ffe7c648378dbb90d9ca7f SHA-1: cda090a6ea1cb8149fdff7749a91b314027f1bd9 SHA-256: 71471e79b9c812808c210ea655eded9712da9bf32e6578c05d0680c94b7b6993
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 heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL, 'https://druttle.ru/123?utm_term=briggs+and+stratton+parts+canadian+tire', is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=briggs+and+stratton+parts+canadian+tire PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414169/normal_601377c3cc12d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_60094f2b7e746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5fe2f1d577317.pdfIn PDF document text
    • https://cdn.sqhk.co/xexodaxafu/haIE6Dr/screen_recorder_for_iphone_5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_600498aad6d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fdf7f720548a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5fcf3cad0e67b.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/IoFjjgd/la_novelita_romeo_santos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5ff195a69a08f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5fcefac696b67.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/cRKWYpc/38867825290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fd398bbeaf53.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/5hiidDx/fejofonosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5fd15a7fa3527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_6006e867cf8c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_6005db891475d.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://s3.amazonaws.com/pozokimepe/allen_bradley_compactlogix_1769-_l33er_manual.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_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 5044 bytes
SHA-256: a8c5fe8d0fe12a618824cad1741a92357e032aa8b27dbbccfeedc0dfad3324cd
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 11140 bytes
SHA-256: fdae4398f76f16e47bed3797d6f4de68aedfcf7db61d0ca990785e8fde8370d1
font_02_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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