Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b5d53c21df38e1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 19:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4798e3cad0604eb5516675a84306653 SHA-1: 3598426e77407aa4f68b01701d2883885a1e3f9b SHA-256: 20b5d53c21df38e162668f297600060482f6f00ca0a826776107f595a96ebd27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and multiple URIs pointing to potentially malicious content, including a raw IP address. The heuristic firings indicate this is a phishing attempt disguised as a download link for a premium service, likely leading to further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=download+resso+premium PDF link annotation
    • https://beytarimcilik.com/admin/editor_resim/file/77138947808.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/siwovezez.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/21932277382.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/sugojosozezobute.pdfPDF link annotation
    • http://realestatemiami.com/userfiles/files/1714904045.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/30788352747.pdfIn PDF document text
    • http://sivam.pl/files/file/gekobajupekorena.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/12022752050.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mexalomalozeroxub.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/34447334311.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210915081224.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/vitobijifezen.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/25598746604.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/jezowokamem.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/37386185483.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161494274dbc92---xevigowokozibifofat.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/56977450374.pdfIn PDF document text
    • http://wixoon.hu/upload/file/delafir.pdfIn PDF document text
    • https://stormester.no/files/file/97503811584.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/novufifunagetivo.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/448929985.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/33925169015.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109151945294911.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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 10644 bytes
SHA-256: 6da8b6d5b89392f66683c060dd2767545cd829bfc43f09477fab667075086963
font_01_sfnt_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16120 bytes
SHA-256: 2ce9ba441c18d00f008f613e37d0e863bdf4c289470b58fb471b4aa0f63a5060