Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b16f6a3d26a39e8…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12e57317e764144f0c9fe5dfb38bfcc6 SHA-1: e46e516a6736a6f8f32378adb9aac9900723987d SHA-256: 1b16f6a3d26a39e81d3586d1e83a545a8a13be9f9440f7b41ec455179d0c0e4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous embedded URLs found. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://akanaymatbaa.com/calisma2/files/uploads/gubisixafijeravakaxug.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/lurelusizoxuzobur.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a4192d8---virosepenefigumapo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090222063273499.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/pibigolupubuxugetegimuz.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/mubapufibabogarofopobijo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zutamejukasasure.pdfIn PDF document text
    • http://apismorava.eu/docs/66936781019.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/pefaxadi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/15102355821.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/14517147706.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/31546972901.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/2513275601.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/femobofepowevo.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/38685422853.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/25697807175.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea8ba9a1---52083311772.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/67254493068.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/41283308264.pdfIn PDF document text
    • http://placc.info/up_image/zilovibufusu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/64654529456.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/pelagazerilamoveveza.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/42551695188.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/95218948506.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zubixuxedenulamazugama.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/66430524247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+best+shooting+games+for+androidPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17172 bytes
SHA-256: f29527ba3f114cb0ef2a17caa149d0b40721d526f0e4fc368afb7ee0da0702f6
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10856 bytes
SHA-256: 50977e0ac404d5fdd91e8d8c149d8eeeaede9b3f8cc56ac582644716fc82c337
font_02_sfnt_off00013669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1