Malicious PDF — malware analysis report

Static analysis result for SHA-256 7158ff3ef27e6ac6…

MALICIOUS

PDF

61.3 KB Created: 2021-04-06 19:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce32fbe395f9287484b24ed8a5bec245 SHA-1: 2bc0178728a9506edae61303ee53f831fc564347 SHA-256: 7158ff3ef27e6ac619488784dcb87e0fd7f9e88df87ad8e91dc02e5538996526
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8016

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dugedepap.ru/award?keyword=meme+piano+sheet+music+pdf
    • http://boothattendant.com/17572569527jne77.pdf
    • https://cdn-cms.f-static.net/uploads/4403274/normal_60357c3619305.pdf
    • http://kinorio5.xyz/goxurul015r7.pdf
    • https://cdn-cms.f-static.net/uploads/4491168/normal_604f61b4739bd.pdf
    • http://voicebftyi.com/319460172017xh0l.pdf
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fc621ce2e66c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b701e897-09ce-42d3-9629-5be0bb0aa9f5/14002992702.pdf
    • https://uploads.strikinglycdn.com/files/39e670b1-de25-4150-86bb-e0a564746e1e/why_does_my_shark_cordless_keep_cutting_out.pdf
    • https://s3.amazonaws.com/vazisi/report_dangerous_driving_northern_ireland.pdf
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_210c422e25cc40ee8121498009eba853.pdf?index=true
    • https://s3.amazonaws.com/kudefem/8297691948.pdf
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_77a4c28629804b809cff56472635bb9e.pdf?index=true
    • https://s3.amazonaws.com/suxuzubojut/rainbow_vacuum_cleaner_price_2019.pdf
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_ecb28c084f974552b842df2baa6b3705.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/regajuwaw.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/how_much_does_bluebeam_extreme_cost.pdf
    • https://uploads.strikinglycdn.com/files/36046ebf-8c78-40e4-9b5a-cc051b070cb0/how_to_charge_everstart_jump_starter_750_amp.pdf
    • https://s3.amazonaws.com/somisilegex/gobifukesajexelo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdb.bin
d3981e08387cbec309f666c592f41d31a362c75d9c7f01e9f13ebebaf3efbf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 5272 bytes

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