Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1e3babcd4a716a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 11:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79772f2e2ad387b991704d354c8efb07 SHA-1: 967911d69a60d90260eb999cabfaacdf46a22850 SHA-256: 8a1e3babcd4a716a23c9bf287aa4d0e88ae599918fc770f96d92f55512be96d6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior through embedded JavaScript and a high number of external links, many pointing to disposable domains. The 'Password-protected archive handoff' heuristic strongly suggests the document's purpose is to lure users into decrypting a payload, likely by providing a password within the document itself. The embedded JavaScript and numerous URLs indicate an attempt to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=zarchiver+pro+mod+apk+download PDF link annotation
    • http://nebovsem.ru/app/webroot/files/files/vifekirivunujerawa.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/48697141930.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210904160409.pdfIn PDF document text
    • http://inspeq.eu/public/files/gexidi.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/lubon.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210906_B19EED88D3F82CCC.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/53872543688.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/69051365462.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jajokipidotixo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109030804427992.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/90803341796.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/lurogeniruvopuma.pdfIn PDF document text
    • http://vuason.vn/upload/files/kegusinapinefoz.pdfIn PDF document text
    • http://elitacasa.it/images/file/85471759629.pdfIn PDF document text
    • http://fedime.org/imagenes/sopogepoxifanazipexibeva.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8e0a2eea---gujemad.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/nonoxukakapif.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/95888877033.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/12321886687.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/lakoteserapivepexedopo.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/savevamujudotorezuwesora.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/serajitavovew.pdfIn PDF document text
    • https://theurbanthinktank.com/files/56378638576.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/12068857470.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/vadajumebebij.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_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 10720 bytes
SHA-256: a6c2cf5ecf50ba00445ab6877584962a85543336771235e5b1d3108f3d9a69d7
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 17400 bytes
SHA-256: b74eb85eb11f3f9a6109bf68212ae478733b31eaea7ba667af5e1ea6d338790a

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