Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f883fafdebb9c89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 11:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 282291a80c4ef1d8b74124da06f3212d SHA-1: dbd1f3c5304e1f4bfeb52d566e4d0a7ed5da4c45 SHA-256: 1f883fafdebb9c8946a24d7a6ff54254f3afd75a9da6be77a530cd2ef10d0d9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains and flagged as a link farm, suggests a phishing or scam attempt to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://badaranquehablar.com/userfiles/files/6710490377.pdf In PDF document text
    • http://travellerisland.com/files/nazij.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/58922072734.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/pijixejixoridazitaga.pdfIn PDF document text
    • http://7profi.net/userfiles/file/78946861789.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/53403098837.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/10845656051.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/rujuwi.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/99301965604.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/simik.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/72531160674.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55202335309.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/bedesuta.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73746036069.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/runozakumamazelik.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/virixudigijesufef.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jexamanoma.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/paratukibemele.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jimurefalevakoxasebu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd0505120---kirog.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/13491403235.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ranigozusuwikujusejiba.pdfIn PDF document text
    • https://linker.tw/files/34471634724.pdfIn PDF document text
    • http://glttek.com/userfiles/file/56698934641.pdfIn PDF document text
    • http://lj-group.cn/upload/files/90986050286.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9f1ff63d0790def098154c0ffd80be5e/92255186371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adb+install+apk+from+pcPDF 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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 18032 bytes
SHA-256: f5d007d29448f4340ef4dcb0d65ac2d1affe2e32f724b0c2c4817024bc61257b
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10864 bytes
SHA-256: b1cb50596c0110c747250c6018da593ae47e56b900c9bc41b4a2f8fac0d61911