Malicious PDF — malware analysis report

Static analysis result for SHA-256 8487a38418c1e408…

MALICIOUS

PDF

90.7 KB Created: 2021-03-23 23:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2906749f8d137c2e61f4e793d09f13e5 SHA-1: 2241f486377ae42140f324c8cb061aacf6ab3be0 SHA-256: 8487a38418c1e408c3fc4e30ce6abb6169eade5c0657d5f38a68644e8f9ddc39
244 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its function as a link farm, directing users to numerous external websites, one of which is a known malicious redirector. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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/award?keyword=person+centred+care+definition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_602229387621f.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/5222324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5fdba195efea9.pdfIn PDF document text
    • https://nekawamanijem.weebly.com/uploads/1/3/4/8/134877182/1454a10bdbe33.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/five_reasons_why_the_renaissance_originated_in_italy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600b347acf9a5.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/7baf759678ce.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/pobupowuliki.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/hindu_calendar_2020_in_kannada.pdfIn PDF document text
    • https://wuxudaboxebe.weebly.com/uploads/1/3/5/2/135297242/vovojusozox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5fdd43d51e2bc.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/41c3f9b8e7d63be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4c0f43-0aac-441b-af70-266b4fc2bce2/98190976602.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/tonicity_and_osmosis_worksheet_biology_101_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/how_to_adjust_temperature_on_a_rheem_hot_water_heater.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/garmin_gpsmap_60csx_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5968ed75-aed0-4728-aec3-01ae5ee1f74f/kenanaletugotofonev.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/airtable_google_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/bodoni_72_free_font.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 5116 bytes
SHA-256: d2f4c569723289163b1074dfd1cbbad980ee6c71927696b4646312c3c62a36c1
font_01_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 11764 bytes
SHA-256: 5fa01b3600def8a9c60288f8fd820b251b69be707340b5809d68872df3671dab
font_02_sfnt_off0001488a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488A 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d