Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd4fbbce2bc5944…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 02:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e94729ab22c6e48688077a772825dcbf SHA-1: ec7995ee90314ce55b7518c52faa10fae5ded0c2 SHA-256: 0fd4fbbce2bc5944a1cc848a9969008e9b3f8eac4fc1b88f36cd9b268dcd2cdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF's primary purpose is to host a large number of links, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=best+emulator+ps2+android PDF link annotation
    • https://vegas-shop.net/uploads/files/77942445749.pdfIn PDF document text
    • http://artepcb.com/upload/files/manetumuzof.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/mogikexexafudemesajeti.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negekesedeluburekonuzef.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///sirowumegodunevijezir.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/18926800461.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f445265ba---lapewezevunewifugoze.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d377bfbee---dobujixusolumuvuboraluj.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/saronuzegebusuf.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/ruroxesivekin.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/pisimupalizuvimigazewewa.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/6387896804.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/zaginizalodizapigole.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/tevewagozonus.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/44138848114.pdfIn PDF document text
    • http://surtek.biz/image/files/20150322_184239.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/suremibuwazeroxomediluf.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/vevigevadij.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/15166641259.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xixira.pdfIn PDF document text
    • http://mq-water.net/upload/didunulubex.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/19713301022.pdfIn PDF document text
    • https://olterus.org/contents/files/sabilapef.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 10824 bytes
SHA-256: b31fee9e552adc7019fa5f49fd920a0cb0b6f4a0973c81104dc7eceebcf3477c
font_02_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 19036 bytes
SHA-256: 41a16b2eb29c113f81a902fec933b7511ba7cf1fe4e312114c13bcde475c1cee

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