Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b881bdcab6c19e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 02:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 512a9e94631cefdd69d07b570c377ebc SHA-1: 71f0eb35d4c9ac179e2b83e564f68bf31f1e2a32 SHA-256: b1b881bdcab6c19e9621d59f8782961c2e4575d39631a89ed819e355924c455c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it's part of a link farm intended to redirect users. The presence of embedded JavaScript and external links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=webtoon+apk+unlimited+coins PDF link annotation
    • http://9meclinic.com/ckfinder/userfiles/files/notivinomurubujokep.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/boxazigomigefatim.pdfIn PDF document text
    • https://senegal4d.com/contents/files/10028135297.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/57047499397.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/17750518613.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/16703427305.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/10729687661.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/milizigegikaligejezegatoz.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/62748454671.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/roxewaminanakirixisen.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b58a162d8---56458906873.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/36901896906.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/14520118524.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_150028.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/75818018315.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/sedutubire.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zarexa.pdfIn PDF document text
    • https://makenie.com/upload/files/20492725855.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/60865833736.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0afecd98---72598872695.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210902084714_2b0uum.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/jusukawo.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/refovalapibafapoweded.pdfIn PDF document text
    • 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 10900 bytes
SHA-256: b7b76260647644dbe3d7243f86cdb5e8ac665560592ed035836ef6815728475e
font_02_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 15100 bytes
SHA-256: 1f04804087b8c96817e980ebf5bafabf48cd9d877f18c035b5696b5696537b68

Open this report in the interactive analyzer, or submit your own file for analysis.