Malicious PDF — malware analysis report

Static analysis result for SHA-256 990cae98e09d4b98…

MALICIOUS

PDF

84.5 KB Created: 2021-02-14 18:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 014246bb1d0f7cb131376d0f69b8c243 SHA-1: ab0e4a0afaf601b36cf0f0712d45da9cd33a3be9 SHA-256: 990cae98e09d4b98fde4efb9c6376596096dd666bc8a368f6aa37d68a8d1c03f
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links and the document's deceptive content point towards a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wb?keyword=service%20consultant%20interview%20questions%20and%20answers PDF link annotation
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/momageretefa.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/bedcc3f770b6671.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/c4e8bb5a4591.pdfIn PDF document text
    • http://jarobadut.22web.org/readworks._org_answer_key_grade_7.pdfIn PDF document text
    • http://axecheat9.xyz/latest_android_version_pie_9._0x131a.pdfIn PDF document text
    • https://pekosorevonoxa.weebly.com/uploads/1/3/0/7/130739373/ce7ad3144e48c44.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/rococo_art_historyruc83.pdfIn PDF document text
    • http://salleapp.xyz/aoa_full_form_in_chatb83dn.pdfIn PDF document text
    • http://natbeach.space/wadapadepizijekoziq7d34.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/aggressive_behavior_journalo86c8.pdfIn PDF document text
    • http://exampl1214.com/honeywell_t4_pro_programmable_thermostat_manualxbn8w.pdfIn PDF document text
    • http://rollernefritmassage.xyz/smoking_cessation_guidelinese8j2i.pdfIn PDF document text
    • http://indohealth365.online/baidu_spark_video_erm8039.pdfIn PDF document text
    • http://shopyou.online/optic_nerve_head_anatomypbwkx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosolebaxuwutux.rf.gd/psm_exam_questions_and_answers.pdfIn PDF document text
    • http://juwebud.epizy.com/78409163917.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/11222483325.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/92255899139.pdfIn PDF document text
    • http://pilivizelonula.epizy.com/63444162882.pdfIn PDF document text
    • http://kenefokugoxetu.rf.gd/topic_sentence_and_main_idea_worksheet.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_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 5312 bytes
SHA-256: d7a95d7275418646c727fea41512dc84060dc775426a8652ab243155164007ad
font_01_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 10528 bytes
SHA-256: 6f43a519fd3d93bb875ebfb34386af54ef6a9ed602f5a275487ba094523125b4

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