Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8b662467604be6…

MALICIOUS

PDF

82.1 KB Created: 2021-02-26 11:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 09ce3152a8165e535a510863f6798d8a SHA-1: c7b8bc573325f67ed0a17e46d6b50b2ced8382ad SHA-256: cd8b662467604be6b441ca5a4b90c546fc5f0a00a91b9c93a8a995e75990ec24
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'conversational English exercises'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=conversational+english+exercises+for+beginners PDF link annotation
    • https://cdn.sqhk.co/zikonidenijo/ljehcnr/nosafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5febab526f562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602574989039f.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/WMtkij1/free_road_trip_planner_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fecb53c1f907.pdfIn PDF document text
    • http://naturebiolog.space/the_sinner_pc_horror_game6nh9r.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/jenisozazewubo/blockman_multiplayer_mod_apk_vip.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/45353879266.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/acid_bases_phet_weblab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/landscape_estimate_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/kebebuvigadokobojipaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/live_tv_channels_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/alien_isolation_pc_portugues.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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 5316 bytes
SHA-256: 4e06facdf009b699eb4287291104fb788a25cacf4c241097033b6aef6a7bec64
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 10556 bytes
SHA-256: 805a25fe458ffbc09ce3849db3607384b8a73a87bb043144227a0bcf07891b9e

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