Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6864a7f53f00c9b…

MALICIOUS

PDF

79.4 KB Created: 2021-05-13 16:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 00032af2357ff43d92f4e15ac39242b1 SHA-1: 9a176e945008c7b0de0a2753ffa797d2a1f4ef89 SHA-256: f6864a7f53f00c9b57798d0db99f69db042babbe6c59cbd567e947968283f5fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be a search result for academic solutions. This suggests a phishing or malware distribution attempt. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing/malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://lozipotod.ru/strik?utm_term=chemical+engineering+thermodynamics+exam+solutions PDF link annotation
    • http://vajokopopozikem.medianewsonline.com/11594943720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_6004e88c6d25a.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/dHhbima/dog_fighting_games_pc.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/61173117691.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/jdLgjsV/chauvet_colordash_batten_quad_12_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/grDijxh/ostia_antica_mapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5ffbcbdbea2e6.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/biodiversity_loss_causes.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/dhethbi/gijaxepopi.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/Bdtggia/kijas.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/tonemakopinibem/7552718591.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/5555576330.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/78546786859.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_7f1442e5bd5e4afd8a1fcf215f1e3661.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_3f7ca08e94bb421987f87a8c2d17b609.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/59465126269.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_f802b59b97fe4be89e27d04fb3f71318.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/cisco_asa_5525_firewall_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/primary_colors_worksheets_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/wililumudolusize.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/sebiribikilalixo.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/33189631726.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 5428 bytes
SHA-256: f740e23936f767e6ecb5b1894b5b29451b33305ea8b03d7fd984b625bea1745b
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 10880 bytes
SHA-256: 8589de336e291a4027fd7ba63fdd33a07a1d91eef4330e23c250d7e493a1cde2
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 16100 bytes
SHA-256: 01e49661dbdd7b4823267156d85e4b6ddc25a6de2ac0af4d78c137cfa2b371b1

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