Malicious PDF — malware analysis report

Static analysis result for SHA-256 716e3c42cceda2b1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-04 02:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ee7eb973d3aea5743f9d5dab60b1a427 SHA-1: 70be8cd08642df36b721d45795dc3203e4b6e7bf SHA-256: 716e3c42cceda2b1c6b524d1946acb19c3add7087949bcb016be6b1f50356fd2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly-hosted PDFs with suspicious naming conventions, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://jacksth.ru/strik?utm_term=a+cuantos+decimetros+equivale+un+metro+cuadrado PDF link annotation
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/lejazezuduvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fff4fb68757b.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/87305583895.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/vevogijigu.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/fixupuwiloxobilol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_6031981f11031.pdfIn PDF document text
    • http://poguvezi.22web.org/utorrent_android_tv.pdfIn PDF document text
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/93b0f94f3d6f.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/e0798b1f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5fc8b25e5a44d.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/4526389.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/mutirexa/quote_acceptance_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/bozewovexebumetotufag.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/alkalinity_experiment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/bifed.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/biostar_a780l3c_manual.pdfIn PDF document text
    • http://fumorumiseno.epizy.com/nilifosow.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 6872 bytes
SHA-256: 83c0ebbff9bb991cc93af282d813e07eff3498bf04ff53b0f9d0884f90a25908
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 5260 bytes
SHA-256: 9c828de3f479dc235a12fef8083d63fbe16156e53b0b11fb6ea999a95666de15
font_02_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 13180 bytes
SHA-256: 4c6ce566073220d9b5c707f9875e465f728cb18fcd379c9203fecc621e2e728e

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