Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5182d506aa1005…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 17:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1efdd9727cf4443441819ac7a5aa92a SHA-1: 9869216a4a554eb2752db64605ae35280d19ce84 SHA-256: 5d5182d506aa10054a029c43dee0ae3e5211141658830e80f4ad0f361d5a1ab1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating an attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/681sb7nua5333bjj5u0o62hlv1/kigiterivujimepaba.pdf, which is likely intended to host a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotararicedo.ro/files/files/misofaberopu.pdf In PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/99941101831.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fafizofiwaduduzewu.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/68919233324.pdfIn PDF document text
    • http://machulski.com/public/file/84497461493.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6btp2t1u61q62b2ea7hop3dc0v/31106527483.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wuvej.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/dukiwajagivuzubuzadux.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rogowubesasasoporemad.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/82800496340.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/75102671362.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/bitiwipe.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/84603326526.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/681sb7nua5333bjj5u0o62hlv1/kigiterivujimepaba.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/gedukitoxuvujamawugurokox.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/040825579265.pdfIn PDF document text
    • https://unitjaya.com/contents/files/tojetizejirewufakaw.pdfIn PDF document text
    • http://www.buildonhope.org/file/xofuzeje.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/gimanurofutewej.pdfIn PDF document text
    • http://sun-tes.ru/files/file/gojajirinam.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/43303877602.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/70001958867.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/dusabegilonafiwabel.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/95965762194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=telecommunication+networks+pdfPDF 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_off0000bb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 11024 bytes
SHA-256: be1087f474a03147a50926b04ba54d6ba819691858632d0e3fedfd4f6ec54929
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 15692 bytes
SHA-256: 203d76366caa9c4dcf73e79195024bffb9363f4a71002cf31cbf2065836fc6a0
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1