Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ad03797b98c935…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 06:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 66b5b86ccd0982816a4a3218e2cc129a SHA-1: 42e2b9164e8a51f107422e6c7e2e2f2e017442b1 SHA-256: b8ad03797b98c935c2a92b643af8a91e5228a9897f1d610964efa2edc9432e3f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of malicious intent. The ClamAV detection and ML classifier further support its classification as malware, specifically a phishing trojan. The document body, though heavily obfuscated, contains text related to 'clinical trials protocol', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=clinical+trials+protocol+pdf PDF link annotation
    • http://4bochki.ru/how_many_red_aces_are_in_a_deck_of_52_cardskxgw9.pdfIn PDF document text
    • http://exclusmxpn.com/takowevavijodigenosapaxfb25.pdfIn PDF document text
    • http://xetorobexojukas.22web.org/xejikexaboramiramep.pdfIn PDF document text
    • http://itdiscounts.info/30605769828bvd04.pdfIn PDF document text
    • http://googsnat.space/rcog_green_top_guidelines_anti_d6xfms.pdfIn PDF document text
    • http://choosemadam.site/arere_yekkada_song_sad_versionw1763.pdfIn PDF document text
    • http://vseti.life/hvac_load_calculation_excel_sheet4dovd.pdfIn PDF document text
    • http://tegor.xyz/870618282555adn1.pdfIn PDF document text
    • http://love-your-lips.online/85432034895xa3n9.pdfIn PDF document text
    • http://realnoe-obshenie.online/bhartiya_kala_ka_itihas_bookgcd5l.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/nevowimo/juvivuzazaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feef9f8f-6eb1-4493-9e9c-9ee744c96510/which_is_the_best_topic_in_finance_for_research.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/korean_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd286a0-2e40-44a9-bbd1-89631ee96ce0/what_does_the_word_behind_closed_doors_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79bd212-5890-4004-abf9-6db5051f99fc/how_to_use_audacity_to_make_beats.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/wibagatofexovavozufaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/sojidanisapuxakagiluju.pdfIn PDF document text
    • http://mapodivopabo.rf.gd/m_audio_keystation_88_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/nixupenax.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/46674095448.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/84524925088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dd0ee8-6fdd-4fe4-b756-cc8b6b56142c/roku_2_remote_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de0be0c-2932-41e9-a27b-154a9b699fdb/plantronics_bluetooth_headset_pairing_problems.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_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 5052 bytes
SHA-256: 845bad1e905e3b761083e409f98cfc463ffb1b2cf5e59f080a54ce918605d338
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10364 bytes
SHA-256: aa9b07e396d2083ccf3588c39495ac9bb90d886f029002b5b4e1bc04e66a5edb

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