Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d34ab950d205f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 16:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5219dd481287b9ed07bccf1431d05b SHA-1: 4b1614ecbe8058b713cd32d968d86f12ec2ecd41 SHA-256: 882d34ab950d205f01241aa8b440ce0b69af03d88c2cf48039d093d9e59f0f08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior, suggesting the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://archism.ru/uplcv?utm_term=networx+app+for+android PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbefcddc93---diwigiwuvak.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/57972492171.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/52334422265.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38271631808.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c936bd1ee9---38899890995.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/96390715502.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/dowopilakoxitolagu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905131121.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/15234784290.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dorobifunezuxap.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/64668062385.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101624147091.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/mubedipajumefepakori.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/71208001770.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/25974218202.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/bikozidamod.pdfIn PDF document text
    • https://777mto.org/contents/files/waromuvejonet.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/29813070884.pdfIn PDF document text
    • https://bachson.net/upload/file/rudepador.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/79971633092.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xapedewek.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://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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 17588 bytes
SHA-256: 98f49dec7f11113bd4abb18d9586621655a3223b77bec7b7650697daffbb8b67
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 10440 bytes
SHA-256: eef9481e8d76dd42c683629252d3037ed75779616298efc701a2306d43ce56ce

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