Malicious PDF — malware analysis report

Static analysis result for SHA-256 0438b957723dbf6d…

MALICIOUS

PDF

86.8 KB Created: 2021-02-25 12:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f3fea50df56f4552719a3f5bfe29da3f SHA-1: d3b610f037da62925dab73bfd817484c9679da98 SHA-256: 0438b957723dbf6df3517ada38353dc81047dfea8f80c39adfec374e1efb4943
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an external URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to a 'community service recommendation letter'. The presence of an embedded URL indicates an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=community+service+recommendation+letter+for+delta+sigma+theta PDF link annotation
    • https://cdn.sqhk.co/dapubebireba/cuDWohb/sing_karaoke_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/gcBYEid/stack_overflow_runtime_stack.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/gfgi2ji/21952737685.pdfIn PDF document text
    • http://dubulus.iblogger.org/weather_report_manzanita_oregon.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/8wiaid3/vekefuxebexavewalivo.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/EMwmjeH/padagowizi.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/metakibeme/public_health_england_radon_report.pdfIn PDF document text
    • http://kufuravolej.rf.gd/kindergarten_worksheets_phonics_and_math_games.pdfIn PDF document text
    • http://salilizuvozel.rf.gd/62142557076.pdfIn PDF document text
    • http://xokeraje.rf.gd/881104122.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/what_chart_is_best_for_day_trading.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/baldur_s_gate_enhanced_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/commisceo_global_canada_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/72916267239.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/escape_room_answer_level_224.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/how_to_charge_my_schumacher_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/guidewire_ceo_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/avent_microwave_sterilizer_vs._electric.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/bmes_2018_poster_guidelines.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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 5500 bytes
SHA-256: 4a027341f98b299403768fa9b8c25fe0218696f1b4d91986021ced41438efe7a
font_01_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 11672 bytes
SHA-256: 9c0179305128a5bcb48c31ebbbf2c6a15824746facd0dc073ffdb62a66cfceaa

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