Malicious PDF — malware analysis report

Static analysis result for SHA-256 05215a14fa9729a9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05f0b49861bd405b19f7c2bce3d281b4 SHA-1: b5aba8cb1c9374b77796e9d066483e7e46ff9d63 SHA-256: 05215a14fa9729a902755b1c304e69e503f6583e8d053fe0cc7e8c9aa419fc41
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. Heuristics indicate it functions as a link farm on disposable hosting, redirecting to various PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=android+developer+internship+in+lahore PDF link annotation
    • http://tsutae-f.com/js/upload/files/91578673282.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/21229840294.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/kotobevisupivir.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/18560113621.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/menomagalu.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/79010681532.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/5855768424.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99085395820.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/69440216747.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/50327813341.pdfIn PDF document text
    • https://asken.as/bilder/file/gejevev.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3084d86916785f9320ff03f956783f44/29103397124.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/71285937119.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/17744230712.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/35638483440.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/917250183.pdfIn PDF document text
    • http://araratmebel.ru/img/file/97913219629.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/wudapididonugoziwavasu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/10487412852.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/41390110951.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ronewatoretidalem.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3bgu2fdqfth9813nes10f2pgn/lolavedafenawaxidi.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_off0000af36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 15892 bytes
SHA-256: 1c4624f3458bb255e9fd7a33d09492c5133078264238790f149596711fd47e10
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10536 bytes
SHA-256: 58a3030b14d2689284362c267f1cee2fe101826b6fd384b4013d8fc1516f1d81
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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