Malicious PDF — malware analysis report

Static analysis result for SHA-256 33950661694b7557…

MALICIOUS

PDF

81.1 KB Created: 2021-02-19 08:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b7604849660563d9fcf38516ed3043f9 SHA-1: 9ed8576996968cb3b1ab6095b18e496f5692d0fa SHA-256: 33950661694b7557d4ea482393f06c7db8bb558f2e759ee617aac52075640b0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://jacksth.ru/wix?keyword=unblocked+games+76+zombie+apocalypse+2+hacked, indicates a potential lure for users searching for specific content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious classification. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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 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/wix?keyword=unblocked+games+76+zombie+apocalypse+2+hacked PDF link annotation
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/6111287022f7b7.pdfIn PDF document text
    • http://gigogon.22web.org/weight_loss_tips_in_tamil.pdfIn PDF document text
    • https://ginupegoforijef.weebly.com/uploads/1/3/4/7/134760486/4208d4673266.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/8917126.pdfIn PDF document text
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/kanerufozanodaz.pdfIn PDF document text
    • http://guwugil.22web.org/taxi_driver_full_movie_400mb.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/lararitijena.pdfIn PDF document text
    • http://jokidinavefo.22web.org/ruxumatadogufukisuf.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/26660.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/d86e40.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/pirax.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/wovugi/13838095958.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/xilisi.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/federal_board_date_sheet_2019_8th_class.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/sediwilapabajejirunaza.pdfIn PDF document text
    • http://fazafowunop.epizy.com/antenna_tv_guide_windsor.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/xanasogowovipo.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/banquet_table_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/linoart_marmorette_sheet.pdfIn PDF document text
    • http://vedaremix.epizy.com/free_microsoft_calendar_template_2019.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 6104 bytes
SHA-256: 3459c17a5d3942c457285c2fe020e4fa879010f1dc2060a143999257bedd4773
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10604 bytes
SHA-256: 58d4a9007b7351789afe66fdaf53bc8d30874669d678df2f7e2923f5e4854511

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