Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec6a246899bcf92…

MALICIOUS

PDF

79.9 KB Created: 2021-01-22 06:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c29a7c58e2bb0f68a9b9e5e2368e462c SHA-1: 976fc574549aa71c250ace33855ab1591af8ce3e SHA-256: 5ec6a246899bcf929854ad39c3cf8fab7ed2d571f01e14d7b24937a913662234
136 Risk Score

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 URL. The embedded URL `https://jottigo.ru/123?utm_term=assassin%2527s+creed+unity+prima+official+game+guide+pdf` is identified as a redirector for free-download phishing. ClamAV also detected it as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`, confirming its malicious nature.

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://jottigo.ru/123?utm_term=assassin%2527s+creed+unity+prima+official+game+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/jijasitov/lgdp0ic/82929588063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fd89ed75845d.pdfIn PDF document text
    • https://site-1172123.mozfiles.com/files/1172123/pogimubetevefexidur.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/ieJu5Hr/64462395964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fe634458fa0f.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/0idnRih/hotel_panic_button_laws.pdfIn PDF document text
    • https://site-1173625.mozfiles.com/files/1173625/79027179555.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/gdwo2ib/56188608490.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/jjhtghk/pajixasuwuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_5fe7723a4b523.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/i1hjhiR/war_of_1812_timeline_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/4Yq0DSo/formula_1_2020_schedule_update.pdfIn PDF document text
    • https://site-1168101.mozfiles.com/files/1168101/classic_rock_songs_70s_80s_90s.pdfIn PDF document text
    • https://site-1168276.mozfiles.com/files/1168276/jaleterulesazamuzunaruwu.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/9iiihM7/slice-_and-_dice_olap_example.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/c4kjdrC/fast_and_furious_spy_racers_rio_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5fce7aa6b62ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 5600 bytes
SHA-256: a2b37a7f2c6c01700a988925e7f1fb90f6343527d6277bfe22c70e2b06680cc8
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 11416 bytes
SHA-256: a7c79b80780035fc9b7d7a7c84badb64e9cc685b02e63d26998af794245d75b7