Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb6e31a2a1a2679…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 20:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dfe7b4de7b5502326fbba49c624b433e SHA-1: 558f74dfcdf15c62a1e8a1d7d38b83fc1bee24e6 SHA-256: dfb6e31a2a1a26799e246e39558ec1c607ce99f3dd6e6ab56ce9c6d75121e57d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, disposable hosts, suggesting an attempt to obscure malicious destinations. While no scripts were extracted, the presence of embedded URLs and the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://crestviewshopping.abwingsmd.com/uploads/files/56117496520.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851cae45f3---lepeniliremenede.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/60281232388.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sonusuwipigut.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144877ced027---fagusof.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/95888877033.pdfIn PDF document text
    • http://djpress.pl/Image/files/vesoromimofulepudabebomap.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/ludekatebuf.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/93948411153.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/vavezodaj.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83603233186.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/11497224008.pdfIn PDF document text
    • http://www.heksan.com.pl/file/80791824815.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/23949479992.pdfIn PDF document text
    • http://raczcsalad.hu/files/pojomadabukut.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/xituzetadutiwe.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/6705599302.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/60535988976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vocal+remover+apkPDF 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_off0000ac2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2E 15580 bytes
SHA-256: c45c82559ea22ba489b9ad0d12c76b8a16fff6382f326cdc1add6ad160f18aa0
font_01_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 10200 bytes
SHA-256: 8af7884a95afee4c55615dc912cfb24faa4077c0b5c4e24100c40e14ebd3a53c
font_02_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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