Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3628d0e0a2d75dc…

MALICIOUS

PDF

66.2 KB Created: 2021-04-18 22:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee797a299d474ad796e14e84048ea9d6 SHA-1: 19ba12391ec1364808b16c61138ab4b722035085 SHA-256: d3628d0e0a2d75dc513c18b62f013f61e9f8a01d14210ac5813d8d527f1b2a92
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to a "nba2k15 vc generator" and includes numerous external links, many of which are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were directly extracted, the presence of external links and the nature of the lure suggest the document is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=nba2k15+vc+generator+no+download+no+surveys
    • https://wajizewikibi.weebly.com/uploads/1/3/5/3/135326478/finexoxo_rikevazoz_lefevatomul_rosud.pdf
    • https://cdn.sqhk.co/jedepazisu/3d7JgdQ/kotipomixiz.pdf
    • https://cdn.sqhk.co/tavedikovo/gcgiyig/candy_halloween_games_match_3.pdf
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/7223954.pdf
    • https://cdn.sqhk.co/vasinabew/fHCxx7e/63774822259.pdf
    • https://fapojenulexo.weebly.com/uploads/1/3/1/3/131383319/losabisipenarisir.pdf
    • https://cdn.sqhk.co/zevijevam/hgiIwha/tovikedaliremepebevoveg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_5e24b261163b4765a3fd4285a09e7ede.pdf?index=true
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_6080a4d01c404a9ba21fd14c342c81c9.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_30f90bb4240e4fe5bbafe768fb322397.pdf?index=true
    • https://s3.amazonaws.com/zobuwubedak/59110454463.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_cb29c38225a142e291b50374748714b0.pdf?index=true
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_c1ecbc2fa3a2464488f7099b3317115f.pdf?index=true
    • https://s3.amazonaws.com/lomuper/nubibojuzidokijolisobu.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_5c1e4980b77e4d31b9316f2c66352ec0.pdf?index=true
    • 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_off0000c5b6.bin
2cdd662718bded050de428d22153329252eb576e2360eddaad87c107895b07ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 5840 bytes
font_01_sfnt_off0000d9d1.bin
225ff25d5747a930d8dcc9d188bc8b2a12ec5735663944dfd824dad7e52187a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10048 bytes

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