Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef6d44716adc01…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 01:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed4bf358b434fb3aafefff030d214763 SHA-1: d483be75ef4f2f11108eb0db7c9f2dd20ff0ad81 SHA-256: 88ef6d44716adc01fb84c86da97e48fd3d8647be1c1086b4db13ea6f0f2596d5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains associated with link farms and potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious payloads. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=i+want+to+learn+arabic+language+in+urdu PDF link annotation
    • http://goldstein.capital/89314060253r42tx.pdfIn PDF document text
    • http://itprod.space/football_training_ideas_for_10_year_oldsxs32t.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/96892737971pf6t.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/761c68167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_601f5313a09a8.pdfIn PDF document text
    • https://nilozirarita.weebly.com/uploads/1/3/4/4/134463528/duzukizejolub.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/dojip.pdfIn PDF document text
    • http://zzzmmmmejjj.space/ligozivamenodigizzizd1.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/c89a8b0e34.pdfIn PDF document text
    • http://vehicleusains.com/vovonudafeselejogis3o8i3.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://s3.amazonaws.com/wopari/hidden_figures_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/nudejipupatedetilixilutet.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/he_s_pirate_violin_sheet_music_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/blocks_game_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/vogapagagepeguderafelaka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 4980 bytes
SHA-256: 26320a87ebb80decb14e78c2a0dac682d071494c4ad4ad11fda0ed3b37c75ff0
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10084 bytes
SHA-256: 197fe5031c1d0ccaad2da2f6feea75850d0a143b46618b7f47ca13689cb49d43
font_02_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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