Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4757781c5771fd…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 09:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5bf97f9fbd0c47725e2c7bd0bf5f0d9 SHA-1: dd3d5b2cacf750e5c6395d8d6b8e36123b5c8a13 SHA-256: cc4757781c5771fdb2c2dc847203ede999bf971e3f18c4c4cbe50f9260871fd0
156 Risk Score

Malware Insights

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

This PDF contains a large number of external links, a common tactic for SEO poisoning and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. The embedded URLs suggest the document is intended to redirect users to malicious sites, potentially to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=unit+price+worksheet+7th+grade
    • https://cdn-cms.f-static.net/uploads/4387817/normal_6025a8cc7742f.pdf
    • http://ruxuzosok.mywebcommunity.org/73575678343.pdf
    • https://cdn-cms.f-static.net/uploads/4368228/normal_605ad52beb076.pdf
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf4a5672efc.pdf
    • http://xenakasewexibal.sportsontheweb.net/72230153180.pdf
    • https://cdn-cms.f-static.net/uploads/4471256/normal_60229f5d31e48.pdf
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fecb4a1dbfd7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_bbf05625d2f54088a67230f3ae5d9b7a.pdf?index=true
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_01f971c6eef74a849c92df19aad5458e.pdf?index=true
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_80dfcebd432145229e778ef9f4c8ff97.pdf?index=true
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_201815c607c54c689acb15efd3f2409d.pdf?index=true
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_59b5fc08b1ca4bccb90c2039c4e61701.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_d792d0ee7bd347d0afba86f6a0ae5253.pdf?index=true
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_a31b89a9647842a88597dac606525b9b.pdf?index=true
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_2e399533f4114317a89ff697785d3bf3.pdf?index=true
    • http://jeximojela.myartsonline.com/boxexeridokomikenox.pdf
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_22175cfbb4e54180a03dcbbb7775e311.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_4d9b4b9d28514968b99ac783e06e6078.pdf?index=true
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_c894ed11c5514e5cae84a7f7e4c215cf.pdf?index=true
    • http://duvodix.myartsonline.com/how_the_grinch_stole_christmas_3_words.pdf
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_05e79942814945f9bb254cd7b9eb0200.pdf?index=true
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_8d3b2399b01b48fb89a4f2ce72e372ba.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_off0000dd0f.bin
a9c5e325aa08daf463cdcfdc89172fd93f31991bca41f1ba661535094435502a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 5528 bytes
font_01_sfnt_off0000eff7.bin
d7f70efae1649f9601198870f3756833c5038bc68c104a0aaf773f42d63bc9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10804 bytes

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