Malicious PDF — malware analysis report

Static analysis result for SHA-256 823263da064ca8a4…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf18732850a9712b8ee07d551c6dae1a SHA-1: fb06b3ce75edd627f708496b5088a5279f479d3b SHA-256: 823263da064ca8a42dccdd1e821030a62594ec34cb6663340c47fbf6aa0a2505
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://vilenefex.ru/award?keyword=paris+france+metro+map+pdf PDF link annotation
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/voxidigor-xanigosuvase-pagaj-wawavaz.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/29018474875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a86c7c637.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/dudaxejasikawozajinepik.pdfIn PDF document text
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/2448418.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/kulutirapumixevomixo.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/83582143827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_602b523e97533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415321/normal_6000e4cb6074b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaduzos.myartsonline.com/jaxegogovi.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ffaa825447144cd5b141a9dbe214f179.pdf?index=trueIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/laxutupepun.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/khuda_wanda_tera_banda_ringtone.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_0495e463684141dbbc7778217bc7ccb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/85770760346.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/tepipo.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_d531c655d97147aaaaadd099cd6f44c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/94647189288.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 5272 bytes
SHA-256: e1d0c34e807435e453b6f2b710f0bb13f4571934a79ab1d18ba6730b2959cd96
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 11788 bytes
SHA-256: b9aa47f1012be92a2df85a39305f9d744b57e747a224ebf959d7615533508db4

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