Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6310534c5848ae0…

MALICIOUS

PDF

77.6 KB Created: 2021-02-22 19:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 07c9229cbe51b4858e13b013bf288e46 SHA-1: 77201f747688c403a59179ebf287fe8f85a49048 SHA-256: d6310534c5848ae076482e4dba9dd9c0abd2839c6deaa1cb823174526490caa1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://jottigo.ru/strik?utm_term=comparing+fractions+worksheet+grade+3', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=comparing+fractions+worksheet+grade+3 PDF link annotation
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/zodufabebob.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/chbjcja/nuganujifilupuwezexakewav.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/8605406.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/egjhfih/80830568675.pdfIn PDF document text
    • http://vekenuv.iblogger.org/xirusafowalimaze.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/Fhg9eqi/mx_player_ashram_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ivhgAjc/57200110487.pdfIn PDF document text
    • https://cdn.sqhk.co/wemegofuk/gfNibwV/gatej.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/taturi/chaconne_yiruma_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/2007_chevy_impala_power_steering_pump_replacement_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/gojirase.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/5895754703.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/35973559003.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/epson_artisan_725.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/sudezizo.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_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5764 bytes
SHA-256: 1b4a91fc2c765bd07211722f89ac88451e45b9ef06d46038f136ced2ca4b06f8
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10604 bytes
SHA-256: 923e2030a2c2b990c4a671b194be79bb46aef9cc8287f71939fd8bdd3be97c4d

Open this report in the interactive analyzer, or submit your own file for analysis.