Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aecd825b5c61b2e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 17:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93556aeecb97f03d9e7d3961bd608fc9 SHA-1: 41d3af2b9676595204d3b874f0d2bf74f8aa6ba5 SHA-256: 8aecd825b5c61b2ebfceee897fccadf766d37d93e809cf16771346e710eedd6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism for malware distribution or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and a high number of distinct hosts, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://crystal-lamp.ru/uploads/files/kababitukezazufe.pdf In PDF document text
    • http://lyzjkgm.com/d/files/15565604634.pdfIn PDF document text
    • http://totoumi.jp/upload/file/munozamigunewimakisokij.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/45875394988.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kifumuxutod.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/dukemapotuzirekowule.pdfIn PDF document text
    • https://proia.bg/userfiles/file/5859160414.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b116c7f92---15592575922.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/85948280947.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/fufokasuluw.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/539784290.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45d0f2728d9b8582fac0aadf79371047/xigubonit.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100017204637.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/31646535221.pdfIn PDF document text
    • http://drironcat.com/images/file/karenad.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/82069442402.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/32919261301.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/68934038447.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zekilobufo.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/61876117932.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/61618548333.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/74876372984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+update+rooted+android+without+losing+dataPDF link annotation
    • 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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10848 bytes
SHA-256: 9fdde49f70c067cc0e6536fdc65c9b912e10b971f117f03b3653aa0b473f6910
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 19080 bytes
SHA-256: 0446584388ab41c57210a35f68dd93968434582f7ef1dcec1f9fd5359dae6e5e

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