Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7204f8ec36a0a2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5443abc2db5c70bc3a9aa1ed55b0183 SHA-1: 564cb9dbfdc5cfe80ab9106c4db1c57150cbda15 SHA-256: df7204f8ec36a0a219a845e5e69c1c7b60a15632c969ee008f8eac559d9541d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://esperanzadeavila.com/fotos/file/38158426787.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/55666770679.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zafar.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/volawewikik.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/katidamedozitebemuf.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/70313362082.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vufifufafepoxixizozugiz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100915116334.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/30816103045.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37582424490.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/19595922435.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/sexevotunafaturuderape.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/14544452536.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/66330090136.pdfIn PDF document text
    • http://workontext.ru/media/file/11564160598.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc2de9fcc---bevez.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/zigixuxutunij.pdfIn PDF document text
    • http://sungder.com/upload/subimabujep.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/11318410057.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a088cfd0a---7947392563.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/56930856275.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902223307.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/95094937338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=instagram+followers+increase+app+freePDF link annotation
    • 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17196 bytes
SHA-256: 8ae22f7fc8280c9276a421ba239d2d1e5395bd39b21abf9b7f23723d1cfc6982
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 10860 bytes
SHA-256: a0359c117364cf877caa0144373a8107b03469dc08a892b9f496932bcffda57c

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