Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0782ecb553a00c4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd1735e2e41062641ebd7dd41f530210 SHA-1: 7e0295969043aef53ab56cf58a42ca3b56abd377 SHA-256: c0782ecb553a00c401a756cff081a77b3d490cabc810004de813be2ded5e5d1b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f45764c4---wefezu.pdf In PDF document text
    • https://cnn-logistics.com/asset/files/2661500965.pdfIn PDF document text
    • https://arerp.kr/data/file///famivowovitopiviw.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/lofodopatidunugideno.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/ridasekusod.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/powibonunonirugep.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/84840622682.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/zawuram.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/jifoja.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wiremoka.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/berimotamebemepugonakuv.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/revipozon.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/pojixuxepewivugakorud.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/28698281704.pdfIn PDF document text
    • https://0900107678.com/upload/file/rawasamamujopagifivapipo.pdfIn PDF document text
    • http://nature-revive.org/files/file/ladunalepexadezuzuwajemi.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dufojepofuparerod.pdfIn PDF document text
    • https://jobtiara.com/files/files/69727565871.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/82225485860.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/10987950573.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/fasuxepubifo.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/41003571144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hanuman+chalisa+lyrics+in+tamil+with+meaning+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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 20592 bytes
SHA-256: 8a20543fecbbc894bd9270cef56e836611384a843783450379b5d12c4a926bdf
font_02_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 11236 bytes
SHA-256: 582246812b51284e5b20aef86bf4ef0c01861dc5dfcad1fc190d570e24ebe314

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