Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bc6be5d7d6d7b2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 03:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a25a45421775da8d53a4f8d3d6d2a60b SHA-1: 087d658c236203353d1c5120d7b8debabf1b522c SHA-256: 11bc6be5d7d6d7b2125cf39e4cda1dbbb3b139a075e8c9697dad883dac827bd1
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to disposable domains and are presented as a link farm. The ML classifier strongly indicates maliciousness, and the PDF's structure suggests it's designed to redirect users to potentially malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=download+data+obb+gta+san+andreas PDF link annotation
    • https://volandovia.it/public/fileeditor/file/61834326829.pdfIn PDF document text
    • http://schokozentrale.de/idata/31342689890.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdc8b18e1---89823379669.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/55109300359.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/69068780921.pdfIn PDF document text
    • https://123natura.com/stockages/files/laraz.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/bamotufewagajekufojupe.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/99198439939.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/pamizaligedugononipiwosil.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tejewomajaxusuvurumivupi.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/gifezimeverodoximon.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zexafilowitifivopozow.pdfIn PDF document text
    • http://e-sheremet.com/img/vofufolavakefo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82698004158.pdfIn PDF document text
    • http://elskenecologie.nl/files/juwaxuja.pdfIn PDF document text
    • http://lecostationery.com/files/file/32672034033.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tenewip.pdfIn PDF document text
    • http://actinq.nl/upload/file/bomutet.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/50432827532.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/zumulikokabavexutavamun.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/boxovonaworaze.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/nodoki.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109041530457587.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d9f6811b2---fikokuvunikosomosavagu.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/3987139983.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16716 bytes
SHA-256: ab28142ac345f1f01934a2eefb578bbcec8b3388d420046ebde3467097cdc341
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10556 bytes
SHA-256: 56a61c8461554b974f36048de2092d9762e771b249d506204264f4fd73bebf19
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1