Malicious PDF — malware analysis report

Static analysis result for SHA-256 50202b7e43a1d230…

MALICIOUS

PDF

85.7 KB Created: 2021-04-13 11:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31393dbb9c679e0bf041d94bc0b6b9ae SHA-1: 4251faad0e75c4933b4a2546fea88c58fa712f67 SHA-256: 50202b7e43a1d2300b270c3c1c5604be479c8f955ac7fc1251979e54fc0bb670
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://xajibur.ru/strik?utm_term=in+the+country+we+love+quotes PDF link annotation
    • http://prizinsta.site/bejararexuvujozuw78t5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_5fd2fc398cf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_6020c0e01e035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5fd787b055791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62cc9a3c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500199/normal_5ff1ce07c48e8.pdfIn PDF document text
    • http://recepty-dd.info/vuviwibabuvx5yen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_6038f96bb3962.pdfIn PDF document text
    • http://jiwepaxitibo.iblogger.org/xalizemopigubaremu.pdfIn PDF document text
    • http://jopkapopka.online/five_nights_at_freddys_4_apk_full_version_free_downloadmip4y.pdfIn PDF document text
    • http://nowtorrentz.com/rca_mp3_player_instructions_mbt00045l1zg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_6018c584932df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_47da5258fadf47f293e14a470d6e552c.pdf?index=trueIn PDF document text
    • http://siletafelit.epizy.com/xepijiterez.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_0725398ec14d408cadb2d12440caedbb.pdf?index=trueIn PDF document text
    • http://sonowodiguvab.epizy.com/agile_values_and_principles.pdfIn PDF document text
    • http://lebubenopi.rf.gd/bar_inventory_sheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/repukokonofididijajure.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/99941102858.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/nuferisadexoj.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 4828 bytes
SHA-256: 5adc64dd4217e5dff778bd9822a748b4347fba98223484142bcdf343ee10f683
font_01_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 11296 bytes
SHA-256: 5d8af9f239085a05cf98f91eb8762db1523e54aecf70bd3b06440d12b41e0777
font_02_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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