Malicious PDF — malware analysis report

Static analysis result for SHA-256 539637e7aab8f72b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 10:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b77572def70dc2bfabe2620b7f771ab SHA-1: f5d1b6e9e12c482d54d3f988fd5a08ffe754ef28 SHA-256: 539637e7aab8f72b317428de21d9d700169f27eecd26adc59124b9c4eba2af14
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The numerous external URIs, many hosted on disposable domains, strongly suggest a phishing or link-farming operation. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=the+complete+grimoire+lidia+pradas+pdf+free+download PDF link annotation
    • http://dragonspond.com/uploads/files/72027563509.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bokesitefezafi.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/vasur.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/97690764303.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fazusidawojago.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bukitutadamewid.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/dexajewinafisenelidabeg.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/tabadukurokanezarufajag.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1b40d8dc2---5455524503.pdfIn PDF document text
    • http://lawngo.net/fckfiles/93399520840.pdfIn PDF document text
    • https://yuktogel.com/contents/files/danosafobawugizivigugesis.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pikilifer.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/nilapetemaxebezo.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/xojamilemo.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/woluzu.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210913213350.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b371835a52---wokotolimugo.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zitemali.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/rutufegidibifinunuvifir.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kogejudokuvokem.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/gelelulumivepuluwudarenik.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/gejusenajujalevedu.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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 11116 bytes
SHA-256: 8ac55f002b4d8f7e0eba70642e2b8720269e54292a9dfe8a730c8405fc1120d0
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 18068 bytes
SHA-256: 1a295f38c78e082b3d3e9c1b3bdda95469ac97679df81df2f89d657ff03a118a

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