Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e55fa68526ecd1f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 02:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd2b3cdf940e82abf655597bb0713563 SHA-1: 60b1f9aa72c9fdc8eb15d6fc0091c5140bb02a40 SHA-256: 8e55fa68526ecd1f69e70a281d96ac7e049725c20fcbba92e95e877c3ac8ec8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URLs, many hosted on disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=limbo+x86+android PDF link annotation
    • http://terralis.net/catalogue_dynamique/file/bivejotinusikoxovuxor.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/us6bov1l1lu3vhj4qro8irrt3c/tukigezexuxulusexem.pdfIn PDF document text
    • https://digireg.gr/upload/93192196070.pdfIn PDF document text
    • http://anpo.vn/upload/files/58604243850.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/85396466906.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/56637742841.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/24390157624.pdfIn PDF document text
    • http://tayles.com/uploaded/xudizuripefanesariravisa.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gonogifisa.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/vibivitex.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xuwowu.pdfIn PDF document text
    • https://miet.hu/kepek/bijusewud.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/lonozolosefizajume.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fozujowijezerufe.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/joredutejod.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/58541747274.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/188681954.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/13003787901.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kowafonow.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/lebirakeju.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83696bc359a3a10a1b87dcab39edcbff/53943672742.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/79096033589.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/71488541531.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_off0000b173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 10540 bytes
SHA-256: eea0618a0196e638d0513eb720f4e0c94dad9226b4ebc6adaab754dd240e9c94
font_02_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 15092 bytes
SHA-256: a2bc6d1100f6b50f8fe7f25ed24f016c90f58f7b4d7a7a3510753380f49e2f74

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