Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d1dfac516b8f81…

MALICIOUS

PDF

72.0 KB Created: 2021-10-02 14:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7f45e27a1b54b9954e77d8cb29b45023 SHA-1: d74aca9d83d156eac7e231c8527b5f25f3a3d4af SHA-256: 01d1dfac516b8f81099ac00f08fdbb4dc508b1e3cf28ca3592bdb4b5362519b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a large number of external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://tl-maskinfabrik.dk/userfiles/file/nazara.pdf In PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/berilofimu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/8958326533.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/62495543337.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/vajubazosufefesole.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fadujexoxasizaz.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/menafimibufabamamanuwezel.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/6684126766.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/kinokilukaxisufoxovu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/13698915187.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074c41f1d5---72777410901.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/64087555252.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210912021823.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/25805556536.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/94512653.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/lobajolimesedasewarasuren.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/texobirizuj.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/robarubaju.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe2079ffdb---kumogimorubazazopiwukaso.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/vosepamekewuvoradek.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/gipokugelukewadu.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/wezuwirududedenamoledetif.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/xotafilowekumupiraledo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/muvugemotukikes.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/kapalojikoneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+diagonal+lines+in+photoshopPDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 10748 bytes
SHA-256: 52072d8567da31e5576d2b13eb780bd4d2ba41bf3e0d4521ddc4a8f46beb2149
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16752 bytes
SHA-256: 3114b1d6b88b723c612dc42f945008f3d45ce4eb97e6ec24cb5e45e10884fe6b