Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e82b5b3446f8203…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 10:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b2703bb9ddda56d0af4499b311900a7c SHA-1: 9aee86d3f544c41e38c72c3afbc84125c6795a00 SHA-256: 5e82b5b3446f820323de596e572198f23fad2e160e1572596cef96459bf4f993
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate further malicious actions, such as downloading additional payloads or redirecting the user to malicious sites. The presence of numerous links, some with UTM parameters, suggests a tactic to manipulate search engine results or to distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 https://isagrinio.gr/userfiles/mibomidigax.pdf In PDF document text
    • https://uat-tunisia.com/userfiles/file/mujijupokagapapo.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/158859168.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/51288867281.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pumolomovovogu.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/seligumelerimugetudur.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/15084662398.pdfIn PDF document text
    • http://herve-coiffure.ci/files/xuvawixolazazodibaw.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/53532689055.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/wokupokaju.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e81ba14---vudav.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/72071878397.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95850574089.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/34451450705.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/89437994067.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/12222839774.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/55823464828.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/95770011711.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/52466093869.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210919135601.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/diligorokagaworuvokujob.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/neposidivabumib.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210912165656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simple+games+androidPDF 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_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 17632 bytes
SHA-256: fecdae2dbbe0cda5c123f40de8fd2c6104182f4ce3bba6777312842a40982894
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10712 bytes
SHA-256: 64211f8c5ef03f210b3fc4a100730d71ba48341011f78129d85ba7aed3e84fb1
font_02_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1