Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef098f0131a66655…

MALICIOUS

PDF

75.4 KB Created: 2021-05-09 02:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 415cd0873832992a7369a7ee27641e8a SHA-1: 77de8c4d7a35e40873e5b20437165acd49b647e3 SHA-256: ef098f0131a66655be6334f638abb9220d167e89f65616959722f169c645a6fe
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 URL that leads to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Ethics book 3' and the authoring application 'wkhtmltopdf', which is likely a lure to entice users to click the malicious link.

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://zajinet.ru/strik?utm_term=ethics+book+3 PDF link annotation
    • http://abwaab.su/buxibadanenasuwovegimow8fgi.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/vamuxopepuruwogutu.pdfIn PDF document text
    • http://mkr-olimp.info/transformers_black_mamba_ls-_03_kozcy5k.pdfIn PDF document text
    • http://montana-media.com/vasikurunaggaydq.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/tp-link_tl-sg1005d_network_switch_-_5_port.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widafasamuj.epizy.com/suzunobejotifutejanod.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/contractual_joint_venture_agreement.pdfIn PDF document text
    • http://xawosote.epizy.com/19479989692.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/gmail_signature_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/90943970432.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/20887537142.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/epidemiologia_basica_robert_beaglehole.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/40517786237.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/62106719197.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/30565768220.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/lasko_tower_fan_remote_not_working.pdfIn PDF document text
    • http://rolugume.rf.gd/stihl_f5_56_rc_line.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/68181351744.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/olevia_tv_model_747-b11.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/amazon_chime_4._17.pdfIn PDF document text
    • http://lukuxuvog.epizy.com/72510150369.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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 4876 bytes
SHA-256: 932c1a1a42561654e0527fbc18ec0bd2b747127f936935f6afdab38fca913895
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10068 bytes
SHA-256: 0f5b0b427da283488ab1456d84e0dfc2a6444d92b1bce67d89bd772e83d510e6

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