Malicious PDF — malware analysis report

Static analysis result for SHA-256 315b7a90604445cd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 07:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8b05db0ea8f80b0a75547fddac33442 SHA-1: f345d93c7c422190ea77b3ee4264bd2af0026cba SHA-256: 315b7a90604445cdd9277ee32593ffacac74129e079ce86359288c0527b2b3f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=automatic+call+recorder+app+settings PDF link annotation
    • https://fabriziochessa.it/userfiles/file/54899052466.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/zemujisanuril.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/vikejinikinozijem.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/divimeworopaxobo.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rimijakopi.pdfIn PDF document text
    • http://cl-pub.com/files/files/96564478358.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/5257549324.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614310467d75a---xerilawixofananamemenu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614578acefc71---72165986170.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/12026299648.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vupizog.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/5724109654.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/14295090249.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xivelulurir.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/21056859107.pdfIn PDF document text
    • https://amgaa.org/temp/files/pevitonizipojixonurik.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/81136676112.pdfIn PDF document text
    • https://nls.vn/upload/files/65668158715.pdfIn PDF document text
    • http://sdes.in/uploads/zemezitodudumugi.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/3430222261.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/fijofedogaz.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/vavafa.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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 17224 bytes
SHA-256: 51fd9f6b7eab2252636c284c10bfe4ee35c1245a144208ad8791c27633aaf5d2
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10940 bytes
SHA-256: ac9774cc48715e02eddfac1f52b11bc159fb200ec1334b8859fff05635790f48
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1