Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8846ffad7e6f336…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 15:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 290ac359d041c757f888cf301cfdaa19 SHA-1: 6a47503f5ac34234240267093ddeb2a493789491 SHA-256: b8846ffad7e6f336aaa457dfb133bca9f5e3a11f79c5e1ceb946dcf335f8673e
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to other PDF files, suggesting it is part of a link farm or redirection scheme. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to lead the user to a malicious site or initiate a fraudulent phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yomamasushitogo.com/uploads/files/ximawa.pdf In PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/11839039027.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuvol.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/56902393985.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6b6d5069---88869491453.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/folix.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/56407344046.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_232525.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/wobuxipowomawif.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fomekito.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kamibituk.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/timokadopuxemora.pdfIn PDF document text
    • http://belst.by/upload/file/vebigizadagonolojosuve.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/litibigelegemaw.pdfIn PDF document text
    • http://heizler.hu/files/file/37823119137.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/45797778245.pdfIn PDF document text
    • http://landpas.pl/upload/file/wotafimofivibisu.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/68774994252.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/1224825711.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/57194566215.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/bukirikajejulupevege.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/domapepevapo.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/gidosuwafusezomux.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/38485122495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=notisave+app+download+for+pcPDF 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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 10744 bytes
SHA-256: 02827a04750675aacce3dc6f4e382db1379b3259449500a675c1abfd3243a90c
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 18100 bytes
SHA-256: 7db4f8c05d4b9f770a746532716226a24afdfff550676750dfd9c828361e12d2