Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70cd9ba3a04f759…

MALICIOUS

PDF

71.6 KB Created: 2021-03-12 18:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1827cf8368b1be8c28b4e9f40c946ad SHA-1: 91484fbf456a6c48b3061ac06923bcf489d2a5c4 SHA-256: f70cd9ba3a04f75918748af57aa75096a9c9b1bf997a97141761caabee7067f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+to+write+a+paper+in+mla+style PDF link annotation
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/7738971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_6025e92ad8a7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382003/normal_5fc6b9e1e738e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fe90c5d4a88b.pdfIn PDF document text
    • https://mirexoxufi.weebly.com/uploads/1/3/0/9/130969656/3518804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_603e4ec41f87b.pdfIn PDF document text
    • http://kameregeperiwaz.22web.org/brockville_police_reports_august_2019.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/b380bda820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_601fb3cda2191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fd23a47cad29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_3be1fa55056c4f6689333879e07d8201.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_0878ccbcb3724c5ca399c3c128c9351f.pdf?index=trueIn PDF document text
    • http://vijesir.rf.gd/clash_of_clans_apk_latest_version_apkpure.pdfIn PDF document text
    • http://navebulaj.epizy.com/php_formatting_vscode.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_01fb0d5d83d54533994e1b83b9542d25.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_316d4faa72fd4b00ae638a3e5bd0f00b.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_2ccf4ee243184734ba44359b0c2a338e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 5120 bytes
SHA-256: 42d2986ca4e2c9458fcd89f8a059eaab3469ea90e87f3c6f16517e56a26f5d11
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 9928 bytes
SHA-256: 6f6aad6cba1c5b86dec54703c5ac0ffd3f82bf6caf0b8acf970579fa70637171

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