Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eaa4a336301413…

MALICIOUS

PDF

68.8 KB Created: 2021-03-30 18:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0e1a87280d1266b287a2ae18d5eea7db SHA-1: 227db78c61d3ae9cafc17bbbd8dcb93f1ef498d5 SHA-256: 49eaa4a3363014133dfae47441bddab0937b882afa24dee79c334da4622b20ef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a PDF URI pointing to a suspicious domain ('ponafet.ru') that appears to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'Aide m moire math' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the PDF. The presence of multiple disposable hosting domains and link farm characteristics further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/award?keyword=aide+m%25C3%25A9moire+math+9+10+11+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450625/normal_602017a11450a.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/92831026052.pdfIn PDF document text
    • https://pefizisiguxuv.weebly.com/uploads/1/3/1/4/131438819/xejasoze-bojajumoxega-rexuxanop-modivoxoja.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/wamolakesefa89y5o.pdfIn PDF document text
    • http://tugrull.com/fumimafojav0oi24.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/admittance_control.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_60530ded83961.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/60861278914.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/39308770567.pdfIn PDF document text
    • https://nadaxobolimige.weebly.com/uploads/1/3/4/3/134365666/fiwinuzotusu.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/dedow_wesezasobatokom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_60066d4ec00cf.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/zagifopububu.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/fabawidawevotometefopup.pdfIn PDF document text
    • http://1cats.space/how_much_does_it_cost_to_repair_a_monitor_screenlzkr7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/norton_introduction_to_literature_12th_edition.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/bill_of_sale_download.pdfIn PDF document text
    • http://limufij.myartsonline.com/zarezefuziw.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/cant_access_my_wd_my_cloud.pdfIn PDF document text
    • http://pasulupumorowim.myartsonline.com/how_to_cite_online_harvard.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/morihei_ueshiba_the_art_of_peace.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_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 5552 bytes
SHA-256: 749a0c96dbeebce707c6725786f55dfc1fd0a800b2762d2609f97b56198873d1
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10520 bytes
SHA-256: 932a7e50858695d2482b9f213a724896f4d433da52272b447b6ec6ac92f902ba

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