Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc25538c3d362d…

MALICIOUS

PDF

92.6 KB Created: 2021-06-03 06:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ad3fc5d0dbd94d0b0842c65ae4470af SHA-1: d297307510a2127370582499435ad7544e559685 SHA-256: 5bcc25538c3d362d09119feaf4eea7a4ec483a4a450d50ad1240dd7418b68442
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure for a "Minecraft gratis" download, a common tactic for phishing or malware distribution. The presence of a "SE_PASSWORD_ARCHIVE_LURE" heuristic indicates the document likely instructs the user to download an archive and provides a password, a common method to bypass gateway security for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/pbw?utm_term=minecraft+gratis+descargar+sin+virus
    • https://static.s123-cdn-static.com/uploads/4488346/normal_5ff7ed9e3814d.pdf
    • https://nebegoxo.weebly.com/uploads/1/3/4/6/134638594/7379532.pdf
    • https://cdn-cms.f-static.net/uploads/4403406/normal_6057b27f5fcbc.pdf
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/jidofudox_nilisopenosofov_rufuronaj_tovinenezot.pdf
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5ff32dee282a4.pdf
    • https://cdn-cms.f-static.net/uploads/4408976/normal_606145c7e9c5a.pdf
    • https://cdn-cms.f-static.net/uploads/4414869/normal_604d25e11e604.pdf
    • https://dutigopomifit.weebly.com/uploads/1/3/4/6/134611267/vuwoxazalixi-ziwutatogekojun-libedopoxafanu.pdf
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ffce1e4cf898.pdf
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5ffa2b88a10e7.pdf
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6024ef6fcf502.pdf
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/fefajem.pdf
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff1e8a737394.pdf
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/dufesotitibomuze.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_60395e2302a99.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_60315b2eed2ac.pdf
    • https://cdn-cms.f-static.net/uploads/4401538/normal_601462503e4d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8e73637-751e-4432-ad44-6d60a0f96e72/tadofisinenudagaluxow.pdf
    • https://uploads.strikinglycdn.com/files/30210541-a2f2-429d-90a5-b0c6b5408b25/24574373378.pdf
    • https://uploads.strikinglycdn.com/files/08422e0a-1360-4812-a919-8e74b19c4e8d/45310582911.pdf
    • https://uploads.strikinglycdn.com/files/94ad1278-b2ad-457f-8192-cb332fa9119b/garbh_sanskar_book_free_download_in_marathi.pdf
    • https://uploads.strikinglycdn.com/files/4086bd6a-7fbe-4ffa-aac3-bdd3ac6140af/ripugekulebaduxasapoti.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ca.bin
8829eecf4f5535344b3985a14a2cdf92e6aa8286c0653e6572051be6909f6788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 5224 bytes
font_01_sfnt_off000116ab.bin
eef6332b6db7903a8c23a2ded0ba0bd9c4e4f60fcf80b7e963e656345aa0170f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 2960 bytes
font_02_sfnt_off00012209.bin
4bbbfb774fa80b4d0de7e50a7c5f73142710e5222760513fa787eb8f6691a683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 12520 bytes
font_03_sfnt_off00014ab7.bin
0d534df8ec2cacc745ddbde4e3c57313ac739be0323573e8fb492e4edd072ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 17072 bytes

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