Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c9090da309abb8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 09:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 061826313cd96652cc022f3acb20e89b SHA-1: d1e0763e82c0f282b7b0f9ef2c7050f7ece64ae0 SHA-256: 76c9090da309abb8e84498e2b4bed833e20f2f2a9560517da20284554048bd7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm on disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware download sites hosted on the numerous unknown URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ty6600.com/userfiles/file/93444192140.pdf In PDF document text
    • https://smartcrm.cloud/upload/files/wugigadudonenuxetobupubam.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/74042012685.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/dd768aa48eb31cf1cb1e481104b5a841/72929572465.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wuvuxulaso.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/50030925846.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/31603868456.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/34831064500.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138bce1f2651---benibobarufede.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/rikitolomogemiri.pdfIn PDF document text
    • https://adikketiga.com/contents/files/miramofovitekizuzilunem.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/29267936234.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/42208343399.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/43431301897.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/64234827182.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/vodibolimo.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/96141368854.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/zanumezoxiginef.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/sobabewigenuvakes.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/livejinisofiragasopilexib.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/49536867688.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/84815696429.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/85799436005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+password+numberPDF 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_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 10904 bytes
SHA-256: f218dbd74242bd61c3911d15c215930a25116a4395156f4e5672c0f0b5c0f704
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 18272 bytes
SHA-256: a40f29e885c011eea80c31163394fddd3bf6247356d9ae2abde3fa3abdfa2ad5