Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fdf1f3869bd55a…

MALICIOUS

PDF

73.0 KB Created: 2021-04-27 01:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d671e467a4d02b65823546d1c64936f SHA-1: 70e3f88f25366d528e3a10af6f5a449ebcc00d96 SHA-256: a1fdf1f3869bd55a9969705bfe9362b70619d42fa221bb52671fad8fcbcf27b6
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 0.9997

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://zajinet.ru/strik?utm_term=the+landlady+roald+dahl+story PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417995/normal_601491b9e7b3b.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/lujufewumiguwamopuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5ffa871bb78b2.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/16ac2cb15f97.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/171442586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5ff6919cf0e46.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/958607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6054b41d9436b.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/94376532616.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/zukajuzabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_605c5f3d19f2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepitar.atwebpages.com/25555911248.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_567171786ad4430dac398fb90d561c5e.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_36f694a30fed41288f6535db99e694ad.pdf?index=trueIn PDF document text
    • http://dufojamimusim.atwebpages.com/capra_cu_trei_iezi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/performance_parts_for_ford_f150_5._0.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/35916158315.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/89541719118.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_b76b01e3a82f407595154a8f0bf65758.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_fd71cb113d1b4c63b9c4a56df1db4a36.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 4964 bytes
SHA-256: c633b6d5f9157fce30e11e591e6ce07283e9a0f7d43bddcac0bdceaab486c7bb
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10152 bytes
SHA-256: df951de49f8a2d5c62eb619672398d1dc73a2f5744b3e026280a3383cbd4b383

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