Malicious PDF — malware analysis report

Static analysis result for SHA-256 860bcb5390b83c13…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 19:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 928fc62c1606c1710e6aa20d1882358f SHA-1: 5ae27b46329694f06e6b25d7ec97cdb76e2e0347 SHA-256: 860bcb5390b83c138ad6bba6d87f7865945a0740a8bfd35b2a0f3e3a2f1f0601
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable hosting, suggests it's part of a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable domains, a common tactic for obscuring malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aranysolyomfeszke.hu/editor_up/21582315252.pdf In PDF document text
    • http://knipia.com/userfiles/file/74424734303.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/12027128645.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/64808481884.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135157146c4b---71966998064.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/74566205404.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e67f5cf06---38710135068.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133cfd72073f---fofaporesesekodegamaxo.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/61028772443.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zakusimurapaloroniletedu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tipemafebarubeg.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/52303204235.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/52768938219.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/58109175413.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/jusavitikabawasowezub.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6365432236132f3eaa2c99.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://allmassage.net/upload/file/20210907031837.pdfIn PDF document text
    • http://youil.org/userData/board/file/96853672875.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/27256838108.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/fazixajusuwibobakatogire.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/35920032363.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/mojegevopokosozu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/mapiteragebegajinigurag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+hack+2020+unlimited+everythingPDF 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_off0000b3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F0 15764 bytes
SHA-256: 5fc39e4cda90dc6a168ce295cf48a870551f4a4ac97f95c7d442d17ea3c1b68a
font_01_sfnt_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 11568 bytes
SHA-256: ef74e54bf37ff53108799797ac101161381402f9aaddbb044f5028d2142d716a
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1