Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7a1dfb858d605…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 12:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f03821c362ac1c850a597cb33b9ce362 SHA-1: 39eb6a3f93539d68ac5224b9b3a1a49a7b450308 SHA-256: e4d7a1dfb858d605c70b508c2e944ff9a5299f7f486bff1c764f02ec259d637a
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/rebebepokonafiro.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///dowotegino.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/71190540131.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/85482419166.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/gavejiw.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wavekotov.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/87355516004.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/5846350400.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/6002627071.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/62532350728.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/21992395478.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/85385475684.pdfIn PDF document text
    • http://netflor.pl/upload/File/tozelifanututipe.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/83290994951.pdfIn PDF document text
    • http://vln.nl/files/file/77885661423.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371384ea372---65216489514.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/37760256414.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907080835175700a8cex5.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/xebobubidegikagevazitasus.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/23730840816.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/faguwigiko.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/78447141078.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/716c69bb740965c531a9312393b7ba2c/sotevidomepej.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903130617.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/kilosutegofo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/revivobije.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/46813505394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+mobile+app+developerPDF 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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 18284 bytes
SHA-256: d19487801777d52ec509c24a132819559f36358acf72a57e201c5f3b355a1983
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10472 bytes
SHA-256: 2b3c6da5830f9ce6e4b62d405b66d8aac8f53052e43da257df9721c0e265a521
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1