Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de74c77388b3f71…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 20:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 94a0db1dac959b139820845e2d4c6491 SHA-1: c7fd2a15a203a7d525bdcd33462b63c8ec255766 SHA-256: 1de74c77388b3f710aac3aad6aed21ca47cb48f3e1b2a9ec73fc8ff715a53009
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the sheer volume of links suggests an attempt to direct users to potentially malicious external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/71120076972.pdf In PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dekuzarexoxaguzule.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca60f0949---wujulupojofidaduxesovuro.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/mewufonijulebulawovaxabi.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/suzuvewovixidifuvon.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fogokigirexorekexamafoge.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/ruwanakasagaribedakevojep.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/nojaxodavam.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109121101032601.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/82153116400.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/87952067748.pdfIn PDF document text
    • https://primer-spb.ru/files/files/sasonevajajebekulox.pdfIn PDF document text
    • https://123natura.com/stockages/files/37729972629.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/56836711693.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/68557331803.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/83l63pem05gvhovqjabnpo98p5/96627111808.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/vimonebop.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/nasisefalalibi.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/sukodukumof.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/mifipuwanuvonidetadimufi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wasudapuwe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/wisosofimokujutamesikan.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/medotikelixufis.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/remafefo.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/xinimipimuzorinanovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=republic+book+pdfPDF 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 15700 bytes
SHA-256: f4c15c8e89354d36095e898bece82020de1c6fd96db277c99f6c88ae03533062
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10360 bytes
SHA-256: 6a5c6b3ad47f495977583f0fd817aaf55786e69a1457417ebe32277214cac485

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