Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f579f6b6060ea20…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 22:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8a8a9984f698e9c0629c7aed327040a SHA-1: 8102cf2c60664b0fc0c3bcc946c65a59dda7d41a SHA-256: 1f579f6b6060ea2099220dceacaaaf047b716909562f756b21618addfcc348ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=comparative+and+superlative+adjectives+exercises+online PDF link annotation
    • https://foodthings.us/userfiles/file/lozowejesubepuju.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/64978541670.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jogatawagimebi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc675ed5b---tujulosila.pdfIn PDF document text
    • https://dacola.com/upload/files/10396479036.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/38038332028.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021093017451164.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/sajurifevejare.pdfIn PDF document text
    • http://scantech3d.com/files/feboludun.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tiferekuvexitelekirafobux.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/16935531890.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gixodumokosido.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/73005202503.pdfIn PDF document text
    • http://air-con.ru/upload/files/69429714246.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210907142126.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/70088928672.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/61530859008.pdfIn PDF document text
    • http://neteyes.eu/editor_up/78366453104.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/pivebonoxeligasuve.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/ramirewedenudazanax.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/63364980226.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/jibiwerafidurago.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/75329210435.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_off0000ae20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 15724 bytes
SHA-256: de0a8b9675c684cfa347f128bb5c11987c70e8ec83c65c06eaa2bb84634bb368
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 11104 bytes
SHA-256: b81b04609e736e8a421dcf31f947d0bb446f4508df2b4fbf68d3904a8bf17d4d

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