Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7b9e1e871bd6e7…

MALICIOUS

PDF

85.2 KB Created: 2021-03-21 03:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 839c10c315c7da5ee83b0dd6e9ea332f SHA-1: 577c46068bda59db8d50a280dfd71ec9b3e5c6b3 SHA-256: 5d7b9e1e871bd6e72dbbf661ea34abbdb7783cca44562c1adb66c70db76bbd03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning attempt. One of the embedded URLs, https://leonvi.ru/wix?keyword=name+change+affidavit, appears to be a lure for users searching for legal documents. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=name+change+affidavit PDF link annotation
    • http://wuramegojuluz.mywebcommunity.org/writing_essays_for_dummies.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/aspera_chrome_plugin.pdfIn PDF document text
    • http://manaluw.iblogger.org/vajov.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/geometric_mean_theorem_worksheet.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/monamigo.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/8324378.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/b3bf46e.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/6317038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sesunofopum.epizy.com/birthday_invitation_template_photoshop_free.pdfIn PDF document text
    • http://wiresudakijiwa.rf.gd/nikoledax.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_10844cc742994258bb37d6ff94581a1b.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_9520634268f24746b0078918b128279f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/rovanabuxozenutamabu.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_0850094d45974ca6b565b8b377639dea.pdf?index=trueIn PDF document text
    • http://xegutosedon.rf.gd/49491638999.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/when_i_was_young_in_the_mountains_reading_rainbow_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/antenatal_care_guidelines_2016.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_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 5160 bytes
SHA-256: 3f593ed8ae70807eaf91d96d4416184cc6dbda47523b295e79511e4022b94d00
font_01_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 10880 bytes
SHA-256: dbba66785a4363341bbcf5a35a340fa4e7bdc8eb19bf89b18cc86aea9d704aee

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