Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaf96bb443ca8ba…

MALICIOUS

PDF

76.0 KB Created: 2021-10-14 03:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72f9d8b31934662ba8ddc0645c025ac3 SHA-1: dc8fd82123afb87e282fdd457ec8f74d5458ec67 SHA-256: 6eaf96bb443ca8bae32dbad4dffc869813ccf2dcceff8849c5ec9b424b4278ef
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://avs-market.ru/admin/ckfinder/userfiles/files/sazibepevelopatamofigesu.pdf In PDF document text
    • http://stilistspb.online/public/files/uploads/files/firemiwujeteta.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///49295727472.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/daxitutefopiguretune.pdfIn PDF document text
    • https://harom.ro/files/file/51407883171.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/makejubokevogewa.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/5528816835.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613538c1be99d---zifufakaterexupadir.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161603af6612ae---21525062283.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/rusil.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/42087602042.pdfIn PDF document text
    • http://floramarble.com/uploads/figuvetuf.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/88436140658.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/77559829421.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vefefed.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/35796132756.pdfIn PDF document text
    • https://aashianarealty.com/file/85715445882.pdfIn PDF document text
    • http://vitrine-prof.com/files/xajiwawajemol.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/69822767608.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/70795244929.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=you+are+my+sunshine+notes+on+pianoPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/29397437329.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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 18088 bytes
SHA-256: 6e9d7b37662e510f13fc5a1e647ef53950294711bff8297d183c05e7e43d7d32
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10668 bytes
SHA-256: 5d627314d55a3744b638b7055109255a306b01659e05c5eca4ff267ee0b7cb64
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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