Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe08d453da7262a6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 13:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2173a1a0093eefb5ca384524977ad5b2 SHA-1: 9180f0c85419130fa95767accf91800af3b6ca5c SHA-256: fe08d453da7262a6123b4004863c4ee93cd1db56d962100635ff73f65914d00c
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with many pointing to disposable hosting and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=android+games+for+iphone PDF link annotation
    • http://wintec-samu.hu/uploads/files/jinokudaxuxan.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303f4001922---tekixitow.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/21582344946.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/73082694747.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pufotemuzofikaporodusam.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/sefozusijote.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/72409435735.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/37446340206.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/jivetapufijezerupakenew.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gadalof.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/revegitidolibulexaj.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60865672350.pdfIn PDF document text
    • http://ipublicity.cz/data/file/4274611637.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/xawotegalefem.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/xaxitasixokufovenomunub.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/goboguselulux.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nutuvidira.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/babalubibunumejexupig.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/81996148589.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jelere.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/vunalo.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/fezabiwotad.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wimajilurewutabinojuga.pdfIn PDF document text
    • https://path.mn/userfiles/files/27874139320.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/jinosopofewuvetul.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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16484 bytes
SHA-256: bba956eead6755203b8b808958c6c6f0041b8bff0d397c91aa6a06940b1035ba
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 10784 bytes
SHA-256: 43ff025a84eefa6f62ee6bb03f02055a711d519eea772deddbffda60dbb54089
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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