Malicious PDF — malware analysis report

Static analysis result for SHA-256 7250b694ad9d0123…

MALICIOUS

PDF

89.7 KB Created: 2020-12-27 01:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8e0b10998b186e7b7f76c50d7cdd55 SHA-1: 14268bb6590145af6bf03f2c01417b10b804237c SHA-256: 7250b694ad9d012334e7a6c4a47ddd58d30e1183de99daa7bb7f8615399cb176
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious and contains embedded links that redirect to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to downloading screen recording software. The primary malicious activity observed is the redirection to a URL designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=screen+recorder+windows+10+free+download+no+watermark
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/wonip-lubixovobonon-wifukorebu-zagelixoso.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/sarijurititekami.pdf
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/rukimikikimajomi.pdf
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/wejutabiwi.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fe1803c56ba2.pdf
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/8818853.pdf
    • https://tofesasezi.weebly.com/uploads/1/3/4/7/134730688/dc7022c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1a70fb2b-285e-4cd9-9f28-35363c5c7ef5/xazopuzazosezeluwewan.pdf
    • https://s3.amazonaws.com/toguvaju/neet_biology_books_free_download.pdf
    • https://uploads.strikinglycdn.com/files/efad2aab-cef8-41fe-810d-f8599b3f5775/mabakewonanud.pdf
    • https://uploads.strikinglycdn.com/files/7ebc489d-3e6c-4cdf-a793-8d031888edbf/70266160248.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011197.bin
658b444a1bdd93e8e510c2aefac0809dfb23c430bcdaa1cc91a36663f9f65904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 5408 bytes
font_01_sfnt_off000123e9.bin
d86f235daebb60481f76f4e82ed8be4bb7bb0c62b2f7290d79ce144895d31dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 12012 bytes
font_02_sfnt_off00014baf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 4324 bytes

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