Malicious PDF — malware analysis report

Static analysis result for SHA-256 3478b2e3d34f6525…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 14:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b95b70881aff7016dd290b9498a7e91 SHA-1: 9a07b4011f135b48b2f2cc278bf6f75e5db596e7 SHA-256: 3478b2e3d34f6525c155dc35b757cb60b1d0fe5280e6891afac0740d9942d6fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ksklinika.ru/ckfinder/userfiles/files/51010156903.pdf In PDF document text
    • https://otterdisplay.com/userfiles/file/wixiwanuva.pdfIn PDF document text
    • http://irollee.com/userfiles/file/viwebozujabifanibipigivid.pdfIn PDF document text
    • https://noddy.nu/images/file/matolafuwapelovawuzavubeb.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/debobifovanawivelowa.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/nosodu.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/losufisebuvemi.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/1914486236.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/jewizeguwizaw.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/69602494137.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/60989258143.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/xafeligegemalefituxuxajix.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4bd900cc---11311801151.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/winudaduvoxujowoko.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20728648442.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xasajufiweg.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/36504983587.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/xekababupexaza.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/96010948853.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109141151418645578oysn.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/77541089335.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/wagawok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=60+free+instagram+likesPDF 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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 18156 bytes
SHA-256: c371a1bfe707b5c43d5a851a4f795c8a843e131b39933a4700c2b4833998b56d
font_01_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 10724 bytes
SHA-256: 4a24f376c498943f890f245f8462ec2c1d366dedd624a25c589f0f9c84109dba

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