Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea2e3a1eef47718…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 15:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3da74f5279cd853f39263bdb44d9f64e SHA-1: 0fffa61a9e3eb1953b7a5893f25273bde2269375 SHA-256: 7ea2e3a1eef4771820b3f4a850ce39c47ce6d1852c42516b3555602017a7083d
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. It also features a high number of external URIs, many pointing to disposable domains, indicating a link farm likely used for phishing or distributing further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alarouba.com/ckfinder/userfiles/files/70535389349.pdf In PDF document text
    • http://syntrend.critical.tw/upload/files/dasijonuvawupenomesox.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/62757533147.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/weseposejujiregamovu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1c3bb687---41480599905.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/67159190842.pdfIn PDF document text
    • http://weldingplaza.com/files/file/57556975283.pdfIn PDF document text
    • http://apismorava.eu/docs/webiratomi.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/lunemafimelafazifedebam.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/91989336557.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/laxigitokoruzeraworebawi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/darubenolulimon.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/66327447751.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/jiros.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/92419560148.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b05d403d9da0adb433fc01340723f279/tefidisukure.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/10226577910.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/todixufavabu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xumiwedofizoro.pdfIn PDF document text
    • https://mkontroll.hu/File/ganijigiba.pdfIn PDF document text
    • http://konberdbio.com/upload/files/29867268197.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/74146008699.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/fukefo.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sefubiwokiru.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/73308667463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=you+raise+me+up+clarinet+sheet+music+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_off0000c2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 18204 bytes
SHA-256: 5c3f8181b5f1bfe8bc0b8936cef27d1cc842254a4a4e10e517afbe9cdf23c25e
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10968 bytes
SHA-256: 387b270734dacaf9a8515cd2f326f4e0c63167499eb5fe607e8de2f1619eb7eb