Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77a53642c56867…

MALICIOUS

PDF

74.2 KB Created: 2021-03-24 20:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b502c378a6cf0d9e48531480c1f08f SHA-1: a1374861b57268238ecb343a542942ff67f2e388 SHA-256: 9d77a53642c56867416353003518bf5f15ed22c6d01099ec08949506e5f3ae43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, suggesting a link farm or phishing attempt. One prominent external URI, 'https://dafemum.ru/strik?utm_term=asustek+p9x79+pro+driver', is a key indicator of malicious intent. The presence of embedded links and a 'download button' lure further supports the conclusion that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=asustek+p9x79+pro+driver
    • https://static.s123-cdn-static.com/uploads/4480750/normal_5fc88fecc0b75.pdf
    • https://cdn.sqhk.co/jerivudofin/4ljeXuS/secret_of_mana_2_player_snes_mini.pdf
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5ffb7dca0daa5.pdf
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/7776772.pdf
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe00403675a9.pdf
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/8547689.pdf
    • https://static.s123-cdn-static.com/uploads/4446029/normal_5ff192f466600.pdf
    • https://static.s123-cdn-static.com/uploads/4392664/normal_5ff08c0fab30c.pdf
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fce18af3c759.pdf
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/difodisowira_zisakuvipati_bifunituvu.pdf
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/nopagebigiti.pdf
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_3c479cb2a08c4990ba2ae01936022078.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5090126-2b43-4f51-89e1-8577e29e7457/keto_cookbooks_at_walmart.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_dc82d3fe9d284ba9aef51f783ec04d17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a0a21f2-63e8-4893-98d1-2afc7ada588a/gofizakapi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63a.bin
181b8de0f1758946cc525f421f6d23d04c740e550897506d7e806fc2304d0229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5128 bytes
font_01_sfnt_off0000f7cd.bin
fca273963a2c16192fa1ed7b24d511cf8b49bc469bff68b5b1a6460750a72e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 10640 bytes

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