Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cdeb66e6d2541c…

MALICIOUS

PDF

86.5 KB Created: 2021-04-07 05:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48782999bd83a2f1f6f12730c7e20b79 SHA-1: c304f6b2e9b5553d30f5f5865ada2c1ced0af650 SHA-256: 16cdeb66e6d2541cca8c56d9dd64fb756013c26e7e4792090c91b5051f952eb3
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://jacksth.ru/wix?keyword=hobo+prison+brawl+2+unblocked+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fec36b1b6b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_604e53d0d6cce.pdfIn PDF document text
    • http://vquest.website/wixipexovawusadovaaotrb.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/jedude.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/3641356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464877/normal_5fc8c738c6317.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/sigeresadi-wuxagu.pdfIn PDF document text
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/zulitozu.pdfIn PDF document text
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/1505878.pdfIn PDF document text
    • https://tolopexe.weebly.com/uploads/1/3/1/0/131070113/zesorugodibud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_60647241c7a2b.pdfIn PDF document text
    • http://topmassage.net/44407267512xxq0t.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/7517141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e840275a-ced2-4d70-bc65-4648d3a17e19/garmin_astro_220_dog_tracking_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c02956-db72-4591-919a-1f026cbd8c2e/88942435142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490496de-e5ca-41cf-956d-f0f09b5baa93/xowibekivigunisebunenubew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c954757-f6e3-4732-b233-a407f403bfc3/31529005094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56847f3b-f145-4113-a4ac-b3b860531f64/light_reader_free_books_and_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad346e3-321d-4ae8-80a1-f21638641e9b/46267329064.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5780 bytes
SHA-256: 071395a277832f36e27f78e8aff57172030259dfa2f644e43f9f1408b3408654
font_01_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 10392 bytes
SHA-256: 27a72d3f4ea6c4bf615fcb2b5265d56a24febf60846ed15c3bba903b860b6bce

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