Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8ae62929a46f71…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 20:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ac2c8e12dd00eb27e8f332c1057ef067 SHA-1: d16b8ad5758d6d6a5a98390ec81d10ac97ac64a0 SHA-256: 2b8ae62929a46f71a2a9ff0a01cf69fd26ec4f3d9bb5043a5c9f476a4bd5bb5d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document's content, though heavily obfuscated, appears to be a lure related to 'solving quadratic equations worksheets pdf'. The presence of multiple malicious links and the ClamAV detection strongly indicate a phishing or redirection campaign. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=solving+quadratic+equations+worksheets+pdf In PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/ef06e080fbc3.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/fudorejakijiva_xigug_pipozep_posatefiju.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/pujuvagodunova_fosinonez_kulesuk.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/925818.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/xepuzituvu.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/veweduliw-xadimizorudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/pitalokenufidimisajo.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/cra_report_withholding_tax.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/hillsborough_county_school_hours_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/32007047877.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/costco_laptop_dell_precision_m6800_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/bahubali_2_full_movie_hd_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/baahubali_1_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/pumewimafowuditevibo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/cv_ppt_template.pdfIn PDF document text
    • http://nutajowaga.rf.gd/what_is_the_climate_of_the_rainforest_biome.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 5864 bytes
SHA-256: dee9ab1c36fcb38ad75cff198d4f4e5778913701bae2ab6c1376feddd28f6dd9
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10184 bytes
SHA-256: 3c072e97d1315f16ca7dbd2226100efaef7b1cae89d81aea8a4d39c27cfc6373

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