Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d5af80357b7ad…

MALICIOUS

PDF

91.3 KB Created: 2021-09-24 11:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89151c678d5c6121f748340d34b25865 SHA-1: e725d11f0e53247ead782f30d3530e4792affb3b SHA-256: ed5d5af80357b7ad9b7166a04e409630bc04d2b335bf400655f62aa8437feb79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number under the guise of resolving an issue. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=cara+daftar+gmail+di+android PDF link annotation
    • https://vadihosting.com/calisma2/files/uploads/77572776227.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/86686948134.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2b9559ad957680691fa9820c00e80417/94024294476.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/92552642714.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/pogode.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/87526618499.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/gubilozonexixuwin.pdfIn PDF document text
    • http://screen.by/images/file/82874983491.pdfIn PDF document text
    • http://riph.pl/userfiles/file/29711022789.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/55134226844.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614410604e114---80826149851.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dilezad.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/12292394218.pdfIn PDF document text
    • http://mamitobe.ru/files/file/vokemejuweruwikurixinomos.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/25482300734.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/gejixixamenavorakinaseb.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909032507.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/28058778021.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/65029673169.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/dunelunarujudemojetufofo.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/wuwopixilike.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/6162568501.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/41593154170.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/27636715379.pdfIn PDF document text
    • https://bem-sa.com/img/file/wanalejokuzewibevo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/worososufirukogugevit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 17352 bytes
SHA-256: 1143eb7ac39ce2d4d92fc7fd63b35798c45f63041df5c906b7d689b743173f0a
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 10428 bytes
SHA-256: 1296b808d7095f3167b657a62d98933eb150fa3ca275323734f59fbd8ac1b2c5
font_03_sfnt_off000146c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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