Malicious PDF — malware analysis report

Static analysis result for SHA-256 a314318e9393a46f…

MALICIOUS

PDF

73.7 KB Created: 2021-10-08 02:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f89fc7929176d4b8c488892622b829f SHA-1: 6a008793df5293e67a9b3a584ffbb7bc8a91abf8 SHA-256: a314318e9393a46fca40daa7692b9d4683f1b8cf1548d0fddff821036f75e672
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=reading+comprehension+for+advanced+students PDF link annotation
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92370579074.pdfIn PDF document text
    • https://windsbs.biz/files/file/jepeme.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/31041265207.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/42291065641.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/89858021523.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/55718268549.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/nafugijewigizupuwerawog.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/93858932899.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdfIn PDF document text
    • https://jobtiara.com/files/files/58417712798.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/937af06dd51c26ff7abbfe0dbbc36606/wigoli.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/vofimiropusa.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/61974869373.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/38497250005.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/kiketar.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/lamokuj.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/pukofigekisuvokup.pdfIn PDF document text
    • https://majubesar.info/contents/files/58578785848.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/6020918831.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/264538454.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/90853231336.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/34775634195.pdfIn PDF document text
    • https://bep.semmelweis.hu/userfiles/file/riruwidezewupeviganag.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_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 16672 bytes
SHA-256: 6e6dd5d847132ddbd6aadb36cbeb2827219b77a63491caa1f73cd4ccc4084820
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 11232 bytes
SHA-256: 779785d803aa02e418f5f630fa2bba0ad10ce9f9e9e1b5b39a029896eabb20bd

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