Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dbd70504800781…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 07:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89616f94f8827c2cb502f2cfc34c9a4f SHA-1: 2b846b731ef5c2de5d611620c2b8e2ecd7f2505a SHA-256: 78dbd7050480078148e332a876ebf60b27eb0e3f7baa4aec641ff44ba99a243c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rainhouse.kr/data/editor/file/210590218061361c9cb5b66.pdf In PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/vinivoz.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/nuvefudokuza.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bugenelifejopuluto.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/gepedukemuranatudebexofon.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4e23d94---99303141170.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/44028402269.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/37304773908.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/45013996904.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/zukotinobosuzedadodedizol.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/98275188775.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/fefowom.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/wofipumimeropudoke.pdfIn PDF document text
    • http://debten.net/UserFiles/File/dunifalivuda.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/18107652195.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84201261614.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/68481988138.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161340b58e79a7---92258380072.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/wulijavux.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/nuvusozuxu.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/16051500634.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/66441936253.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61320b2379eb4.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/futawas.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/17315902287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arch+linux+android+emulatorPDF 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_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 10648 bytes
SHA-256: 4d4f76ad752b425e916fb2c0f07287ddd995125f2640bf53a4cc2a2a611dfa3f
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 17364 bytes
SHA-256: e6bbdf79468affa93968269b147f0b39a3f85a860656e73f87e2490efc470e12
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1