Malicious PDF — malware analysis report

Static analysis result for SHA-256 182109a1e2d810f8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 08:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6da6133f8b838831a854f8497b94b34 SHA-1: 6ec15e691d5481643bf2e91328208272b849e35a SHA-256: 182109a1e2d810f83adcdd58e38d6117e476ce11d7084bfe26bf64f8dc8c5cf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous links pointing to other PDF files. One of the embedded URLs, http://hzzxtl.com/UploadFile/file/20210918101458719.pdf, is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hzzxtl.com/UploadFile/file/20210918101458719.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/93841269425.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/kovepoxeraz.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/72369905592.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/sawatifawabusuzokitela.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/62903421117.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gixamoxifirifiwuzef.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/ripoxipixujigag.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/39943379182.pdfIn PDF document text
    • http://ukrfirework.com/images/file/46296869531.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xikavelozodojuwedo.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gesusisuworeg.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/lebege.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/pumogedafulixutinovex.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/petugezesadasajigivaz.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/sukagamevikiwokiletut.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/nigurisigegewozamadagozok.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gobedo.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/30313693897.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/25357766775.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/14280686931.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/kukebuwikujabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=new+veteran+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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 10040 bytes
SHA-256: 8e9019a8610bdc2c56b8c264f5e826230c90d4ee56eccb81e2756b76c604a84c
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 18172 bytes
SHA-256: 1430ae9db615df47f6625170c92cb9b1189f9aea5bbd298bb0210e295d3628ac
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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