Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c287da87894cd90…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 02:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e522f540dd1fb86f182d7382a308aa1 SHA-1: 6604e01cbb6cc47fdfb42e51baa22e239c41de0e SHA-256: 9c287da87894cd901b184b56e23fdd157e4e9fe16624f38896bea4d4a5fd30b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or SEO link farm. It contains numerous external links, including one to zajinet.ru and a large number of links to weebly.com and other domains, suggesting an attempt to drive traffic or distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=solr+reference+guide+6.6
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/5810104.pdf
    • http://help-igcopyright.xyz/56246992951ju6qd.pdf
    • https://nosugorowemuz.weebly.com/uploads/1/3/5/3/135327492/binifekaxewoweket.pdf
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/e15603497581.pdf
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/vukitabaxusu.pdf
    • http://obuv-kozha.ru/poxaxebed3grdx.pdf
    • http://huaweistoreukr.xyz/financial_statement_analysis_lecture_notes5idi7.pdf
    • http://freshka.fun/tulukegekugesogoxuwi51ng5.pdf
    • http://magazinrf.xyz/sujinofefuxudiziripenusinmgzk7.pdf
    • https://numevajuga.weebly.com/uploads/1/3/0/9/130969633/sewepan-majenilawut-ramiduriwetivi.pdf
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/3042019.pdf
    • http://meetsalon.xyz/foguwuni85mun.pdf
    • http://exampl1214.com/27509631588armrm.pdf
    • https://nurivotewifigex.weebly.com/uploads/1/3/1/1/131163684/lijuxeto.pdf
    • http://natnat.fun/super_mario_world_3_castle_star_coinsia4td.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bitines.myartsonline.com/88384680258.pdf
    • http://sawurawefivovo.myartsonline.com/common_questions_and_answers_in_job_interview.pdf
    • http://vomovawesojuti.epizy.com/nodikuja.pdf
    • http://wonegesaf.epizy.com/alan_walker_spectre_music.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_off0000e8ab.bin
4051e42d3e0d3367ff32255fd1ab6412734058f3fb2587a6d5a8142eeeabffe1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5092 bytes
font_01_sfnt_off0000fa14.bin
d3ae9c385f6f9345ca19fd6e97333a7efc7912f5e57df12dc086ec785678a790
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10200 bytes