Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff8cf10f6a052fc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 17:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b71ac4bb6d256a981abd6eee5019291b SHA-1: 026163736f2da5bb78caeaa5f174662574518055 SHA-256: 9ff8cf10f6a052fcdee62e2f690a4cfb8b0a028795c7341ee93f93071d37402c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or distribution network. One heuristic specifically identified a 'disposable link farm' pattern on disposable hosting, indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/65447376199.pdf In PDF document text
    • https://digireg.at/upload/93096674638.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vovin.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f72328b639---voxilabapisisoredarikalaw.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/1929499830.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sopeverudotogigunen.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/55415331723.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/87631155071.pdfIn PDF document text
    • http://ssp.by/var/upload/10954140111.pdfIn PDF document text
    • http://lamay.de/userfiles/file/nogogigava.pdfIn PDF document text
    • http://qwerty.pl/_data/file/vabuxagumaxefegenowu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/44036502357.pdfIn PDF document text
    • http://acelybio.com/upload/files/58034842714.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/28696825429.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zotaniseloveziferu.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/82814608603.pdfIn PDF document text
    • http://slsnn.ru/content/files/4919340090.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/61563898249.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/77569369130.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631901542.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ligej.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/42919618605.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/61996295882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=completing+the+square+surd+formPDF 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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 15912 bytes
SHA-256: 2a778ff8caaaa2c8c8ded05ae1dba6c18f41d91c6a87cd82f7eba53e7f03ee0e
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 11224 bytes
SHA-256: 9df105472f69b722702318bec146228e6f0937b252e44bf8035cd3bbb166dfa3
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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