Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40fe7e04563a21b…

MALICIOUS

PDF

93.9 KB Created: 2021-02-26 10:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 331929fe583c50ba15fb4c8085ac425a SHA-1: 3f88b23fd2d0288612fcfb73a7b84a65bc503d64 SHA-256: b40fe7e04563a21b2b84ad157e912b7628a41510a639c62ed09d52dcbaa860c5
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that mimics a search result, likely to trick users into visiting a malicious site. The presence of multiple suspicious URLs and the ML/ClamAV detections strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=land+of+stories+book+4 PDF link annotation
    • https://cdn.sqhk.co/dikozogub/jihjbjd/43536107153.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/hOHhhs0/instagram_story_viewer_order_update.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/KctgcWw/democracy_now_youtube_october_15_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/olTgUhg/zukakabasop.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/how_to_build_lap_steel_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/iAo251u/mugeb.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/YSgeidd/hill_climb_racing_2_hack_online.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/what_is_a_functional_analysis_in_engineering.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/duwelijutumozuganekiperab.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/pemig.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/printable_calendar_2018_december.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/acr_ultrasound_quality_control_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/ubiquiti_unifi_ap_ac_lite_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/types_of_sentences_worksheet_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/infernal_mage_osrs_guide.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_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 5104 bytes
SHA-256: 8929428a2b34a7a653831ce2fceab0a5a8f592e970597300ece72993c5cc13ee
font_01_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 10244 bytes
SHA-256: 475cfecc5811c6559763ac09028d004f5573cb2b6ebf8ff724fbb28451573e4a

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