Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86cec89bdaf05da…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 17:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53652dde517bf32522f056de230361d3 SHA-1: bef5ab3542a267a25a8986bff4e40fb0ccf87a8e SHA-256: e86cec89bdaf05da38cdef27fc2ba143b8710c201b3989776949625826371464
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=cannot+see+iphone+hotspot PDF link annotation
    • http://airsoft1.ro/files/file/wotuwokaniruz.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/nobojabolosa.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/jobazebufagudera.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5564661558.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/58021718781.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0c29f50de8375b0db18a3767c8a9484a/11940575932.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/soviwunito.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/27371922748.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/melobomomurosozabe.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/17865294457.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/47414543168.pdfIn PDF document text
    • http://slsnn.ru/content/file/77353078301.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cf7eaaa7---gebawufazobu.pdfIn PDF document text
    • http://amkchem.com/upload/files/xamudexejedibilatukerijul.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tuzalir.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906104433.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/81203613428.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/3464688695.pdfIn PDF document text
    • http://yanartextil.com/firma/files/razopijefovu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/dukaradefikasuxa.pdfIn PDF document text
    • http://lejuriste.ru/files/file/sumefol.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/dediv.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/13944840615.pdfIn PDF document text
    • http://identik.hu/editor_up/wekejaniwelopaku.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_off0000c565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 17144 bytes
SHA-256: 0bc64e38661c28075c9532fbf7bfeb8ace5d65f006635bdd6c0c3dda31bd0f1c
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 10236 bytes
SHA-256: 1b75e2eaf93270d7cb999912e06634fde70ab15784e90fc6aa0416837fd5da6e
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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