Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423c17dac1b99a8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 19:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 302046fddb5d97003ea08c09642c9185 SHA-1: 079a489d2a38943343e95132b44ca4e4edec7c1c SHA-256: 5423c17dac1b99a8bb00b597a7e687b0c6a9ef1d40a037da24e297fe082950f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. One URL, 'https://allytemp.ru/uplcv?utm_term=instagram%2B%2B+view+private+account', specifically attempts to lure users with a pretext related to viewing private Instagram accounts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=instagram%2B%2B+view+private+account PDF link annotation
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/wuwowez.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vavipodidarevafakapifip.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/kuduvefumetinulodesod.pdfIn PDF document text
    • http://vhz.cz/user-files/jowifiruponuduvuminulu.pdfIn PDF document text
    • http://talesma.com/E/file/2071270463.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/8716777478.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kl16u7mjrs3hcf7fohh3mttn0/57976369511.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/15902302232.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/76119795365.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/71599158061.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109071431272567.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46664287554.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/gixifelefatopanaxa.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lataweramapafemagevubeguj.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/93522320200.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/61447240466.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4ce6d9d3---75239307800.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/70739399597.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65291289050.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/podalifezujezupeposovisan.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/gesogulowogajolilikumaje.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/rikakupawolopuzox.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/wowed.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/faduzuxomurimavowunul.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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 10876 bytes
SHA-256: 0942a3a9bdd0ded831da69584b289aebac8eb8a179b77ffaf3a8ec7f683ea972
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 18168 bytes
SHA-256: eb46a66b542d4a6c13c6627810db4d402da82e0c3bd85f89e6ef8d7deec6c9ed
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1