Malicious PDF — malware analysis report

Static analysis result for SHA-256 a651f8324ca2a543…

MALICIOUS

PDF

77.2 KB Created: 2021-02-12 11:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 92e9ced02fb76185b717307df1f15c31 SHA-1: 5b1cf036e98e81d86492a4504d4978c3b2c3ddd1 SHA-256: a651f8324ca2a5430d3405b4a2b5c01f92d19a1915a85bfd96beac2cdf70b07e
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 0.9996

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://bologen.ru/123?utm_term=hoke+county+high+school PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464313/normal_600173ae3e5e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fd868fe32257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600cbac41a5f1.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/2661574.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/e64eefe5.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/QVhfiep/example_swot_analysis_marketing_department.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/1249324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_600fad640e8e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5fefda64008e4.pdfIn PDF document text
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/pumazipedi_wuxijixi_vugoju.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/6aKjc2O/soccer_star_2019_ultimate_hero_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fcead0798898.pdfIn PDF document text
    • http://midazimika.iblogger.org/verbal_ability_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5fe74d45f27af.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/gdvijgg/punewizogebamurapelaforov.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/4509360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_600fca584ca8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/how_to_insert_tick_in_excel_sheet.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/pozodedejovirubewupoviga.pdfIn PDF document text
    • http://nixuverojezuluz.epizy.com/android_10_one_ui_2_beta.pdfIn PDF document text
    • http://roxegubipav.epizy.com/zavozoterodunoruronup.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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 4880 bytes
SHA-256: a5be38c3decd627e46f192be7a2ba401f66b001c1e1ce93450c83134c176491c
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10820 bytes
SHA-256: 348e5641948fe1ca81fa1ca036e978960278bbfcaa62bf87287ddf38200468f1

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