Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af2e9488723e68a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 14:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e5972a8176075a0b7e6963c0e7d577c SHA-1: f9f86b97415e47645e90670b03fcab490ba5afd4 SHA-256: 7af2e9488723e68a378ed9c9bd1c27b6274350877dc08a73e92ce52356b52895
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This script likely redirects the user to a malicious URL, as indicated by the presence of numerous unknown-reputation URLs within the PDF. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=the+watch+anime+online PDF link annotation
    • https://www.retake.dk/ckfinder/userfiles/files/samital.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/96261257399.pdfIn PDF document text
    • http://baove24h.info/upload/files/xevikufiw.pdfIn PDF document text
    • http://progetec.org/userfiles/files/virisifufotuzulibilajudog.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/54696436653.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351231b6e50---93582011383.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zodasilagojubuko.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2e267a3omkcefcabru5vn02541/bejosavonulixabovilimolo.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/totuzotum.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/56677568236.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/senoxupewetu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/nomowote.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/56324238367.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/45284401006.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210917213725.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/woxezudarasu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/94865113731.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/fimamage.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/41631292012.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/vuxavamowitajuze.pdfIn PDF document text
    • https://jobtiara.com/files/files/rukenabonofosaduwinop.pdfIn PDF document text
    • http://stisk.com/file/1341385415.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/14412873515.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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 15284 bytes
SHA-256: 4631274298a39ec15138d5bff0bfce9ff334d462073f998052105166bd165aca
font_02_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10276 bytes
SHA-256: ae9accd0e5b3d29fdb6cf9dd5264045c5d3a025761978b50fa3ff7151c0ac834

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