Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccb0ca5149da169…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 14:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc2f577014f04eea33aca418ad9e7104 SHA-1: a8fe827ece0d57197cad109929cb365a13bbea69 SHA-256: 6ccb0ca5149da169f50e4b47e12eaacb1453a95e4eb8c03529813ff0d926d253
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to PDF files, suggests a phishing or content-luring attack pattern. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering tactics to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://zegaoyun.com/calisma2/files/uploads/wugamiluzujulun.pdf In PDF document text
    • http://flyingfish-stay.com/userfiles/file/4323699813.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/14246195158.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/39178859916.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/67300853216.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/66248200749.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/84119574818.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/68964535541.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/zeninorufizabigasajebet.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/75092755112.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujefasuxide.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62748336328.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/346235803.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/bewalose.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/9476476373.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/14302922998.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/jadezipidelozorelixud.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55c362cea---12627290951.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/jelositenuboxudonoz.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/9493628733.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/delosusibadopufape.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/40663942990.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f265dc46a4---1653623621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fmovies+tv+series+onlinePDF 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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10148 bytes
SHA-256: a1c20ab71b28911ca000053dab1768b8179bc09713608b7ff24b44eb5e620242
font_02_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 18000 bytes
SHA-256: 0610961d946ec0551dedce57462b7ca06b0b1cb746b6b3ec289261310289d315