Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb199ca75781d22…

MALICIOUS

PDF

71.9 KB Created: 2021-03-17 09:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a34c2673d43f1ac441c14fa9247dd2e SHA-1: 6cdb43871a5fb1f466472082fd566adeeab43149 SHA-256: dbb199ca75781d22943cbc9ea2a093f07a8aaf3ed9e8647ee5389b24cfa3c787
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a visual download button and embedded URLs suggests a phishing or malware distribution attempt. The primary malicious URL identified is https://zajinet.ru/123?utm_term=instagram++jio+phone+2, which is likely used to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=instagram++jio+phone+2
    • http://mamafiposorugul.sportsontheweb.net/28915695688.pdf
    • http://repair-foto.ru/8213657659vkgz9.pdf
    • http://fitness-ital.fun/practical_theory_complete_sandy_feldstein_answerskjwm2.pdf
    • https://cdn.sqhk.co/loxowopiv/ihdgghb/junadubusapijuzisile.pdf
    • http://qwertyujg.xyz/kazirenivosafjj.pdf
    • https://cdn.sqhk.co/moserusoba/jfifU1c/helix_jump_2.pdf
    • https://cdn.sqhk.co/dozelodet/fjgjjc2/can_i_forward_calls_from_my_iphone_xr.pdf
    • http://nenegifivujaxu.mypressonline.com/how_to_convert_to_word_doc_for_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxegatulo/percy_jackson_book_series_synopsis.pdf
    • https://s3.amazonaws.com/genedesowul/topographical_survey_report.pdf
    • https://s3.amazonaws.com/vavabi/29498193657.pdf
    • https://s3.amazonaws.com/sesafefanulokam/hiv_and_aids_treatment.pdf
    • https://s3.amazonaws.com/dazuxujepov/faxarizujutu.pdf
    • https://s3.amazonaws.com/vuliwisuwig/xokifodegupadobubumiket.pdf
    • https://s3.amazonaws.com/vufuzewasi/twisted_metal_2_ps4.pdf
    • https://s3.amazonaws.com/tozaduliwubega/esma_guidance_competent_persons_report.pdf
    • http://mizetum.onlinewebshop.net/how_did_alliance_system_cause_world_war_1.pdf
    • https://s3.amazonaws.com/nitizobuv/jubogaki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d8.bin
1be810594be664ee951aecd543d01795cb30a0939eef1105fc5585200b7e091e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5344 bytes
font_01_sfnt_off0000ebe6.bin
97d90da94095a40991d9c3ac433bed44666cc47f37a7f14df478a2c172ca78a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 11048 bytes