Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc91433f13a530a0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 15:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee6c0413f0449ed15482c5e4cd34def6 SHA-1: b981af0803705e88bbae1f3a996c78ea36e6e6bc SHA-256: dc91433f13a530a0f8dec1b69a2fc8f3f6ce473f78056ce2a768464506f733e1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack, likely to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • 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://petra-koparki.pl/Upload/file/59284591916.pdf In PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zogukemizurepiregenajak.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613C2B5474695.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/widadotubewelatuduwok.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cb6a09a9---87496259164.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905002123.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/78079384165.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sutel.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/nikusife.pdfIn PDF document text
    • http://knipia.com/userfiles/file/kuxarapidu.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/mifavirizidoteruxifex.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/32733367616.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/tamujuwezapiver.pdfIn PDF document text
    • http://lobi.md/userfiles/file/nolipesifazukiluwabajuf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705215b424---peguda.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/xiwilinedaxewe.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/11111917600.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/koralamigilepem.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zomubawoxukamobamo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/58243511434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ubs+mobile+banking+app+androidPDF 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_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 10876 bytes
SHA-256: 276f439ada84816cf80630c1d75fab54ef556e83273d19e64628c5bf1c4658d9
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 18320 bytes
SHA-256: f16ba4f04d7876a47eb53f519b1302fc8a4769a66c6436e9d421652ada50b5be
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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