Malicious PDF — malware analysis report

Static analysis result for SHA-256 e848d57fe877de03…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 23:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b44453fa2f54530911ca72790bcdc6e SHA-1: 9d210f0cba3ee184e1ddc36ddfc4f8af76dc943a SHA-256: e848d57fe877de032569271e6ce74b68b6532780059c26e19e5255274db74e97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links suggests an attempt to direct users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://faptvmedia.com/userfiles/file/80117361831.pdf In PDF document text
    • https://camphacement.vn/upload/files/92200384135.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919142123.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614a234f383bf---50003380009.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jobozoxetizojux.pdfIn PDF document text
    • https://duel.pl/userfiles/file/gulenafiva.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e9344f1f---nuwijisowikabija.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/84245696460.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/71719539877.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/86467986407.pdfIn PDF document text
    • http://mayjack.com/upload/files/pogag.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/jufubunepap.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/pamojemizakabotilelepumet.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/papagadopaparagi.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/baxufeluwidogomuvekud.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pibipavozatubizawikuxik.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/93978205169.pdfIn PDF document text
    • https://fond.ru/userfiles/file/begomo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/dofujijo.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/fedewimilonunawot.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/dapiremodegodamaj.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/19556535337.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wukefavojiwavelomow.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/jixuvowafizinanilewi.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/taferabazubowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fitness+app+wear+osPDF 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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 15220 bytes
SHA-256: e2e686520e9ab9b69ba12a524f8dbfc35f7db92f62071b56fb378d9d8e90dedf
font_01_sfnt_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 10260 bytes
SHA-256: 2df6c363dd976d4d4841d6089cce622d499b2c33ec8eede1eb8baeb236615b17