Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08674044ac10d22…

MALICIOUS

PDF

104.3 KB Created: 2021-10-08 05:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4aee14bce7b6f2a25f7b9684a7118b60 SHA-1: 3c89c3699bbde2cacc8a914322458eae680948c1 SHA-256: a08674044ac10d226605aea62403521a38b2062c39065afafe3398593366bf91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or trojan delivery. The numerous external URLs, many hosted on disposable domains, suggest a link farm or redirection mechanism to further obfuscate the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kotypsy.pl/ckfinder/userfiles/files/67153099678.pdf In PDF document text
    • https://sanidom.pl/img/file/ruxufidob.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/83385549906.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/zoduw.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/17677274020.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/gofijozijafufolitamine.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/84241678111.pdfIn PDF document text
    • https://gangnampools.com/contents/files/wasefumuxi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/43931954168.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/noketom.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/zadavagijugoxumefisavane.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/tejigeg.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/99391781693.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/60039599286.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c40ce01235---15748529957.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/furasajira.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/24214105729.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/30297618835.pdfIn PDF document text
    • http://chipgene.com/image/files/20210930_090050.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/78976846205.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/lajefejuzifu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/48849137113.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/womefagoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=1st+micro+computerPDF 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://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_off00013351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B63 20904 bytes
SHA-256: 3b91655bb4ef44bdb5b2580a1001d3d650006b8bb8bab6fb438368b44401fe14
font_02_sfnt_off00018170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18170 10276 bytes
SHA-256: fd056b080c5717057027123ed0c644eb15020772a88fb5a9a29b6fed64bddfe3

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