Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b2f444e8cfc2a4…

MALICIOUS

PDF

107.8 KB Created: 2021-03-08 16:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 351b3ea1d9dc58d5621535a1cab3203d SHA-1: 5e37ea3e22d3b24016d51c4187292c111b8f7b5c SHA-256: 24b2f444e8cfc2a42dc9785dc25b046c96608ca50ad12571cf4d91d76bc5136d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/award?keyword=antihyperlipidemic+drugs+pdf PDF link annotation
    • http://milanbeachs.space/excel_sheet_for_expenses_and_income_monthlyp9le3.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/f93a90f4f49d.pdfIn PDF document text
    • http://smm-target.ru/jeluzesopaxeduratuduri8jteg.pdfIn PDF document text
    • http://hotsales-com.xyz/43897474341aiar8.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/4681cc700d3ae76.pdfIn PDF document text
    • http://sibuvre.com/what_comes_after_the_knowledge_economy5mig4.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/college_board_sat_chemistry_practice_test.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/xekuk.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/musoxifuvitalo/how_to_tie_a_slip_knot_for_leather_necklace.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/2013_dodge_caravan_sxt_features.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f942b1-d612-498c-8a1d-50b49f9d0972/arduino_ide_c_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74dd965-b7d1-4842-9a20-e162d73112b2/2004_g35_transmission_fluid_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e78cbe5-5d1e-4b66-8b9e-a88365e0eede/95102680938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b545a441-48b1-46ca-be07-a5e6d9d85a66/86068402254.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/symbols_in_le_petit_prince.pdfIn PDF document text
    • http://misugivunuzu.epizy.com/jusosisexov.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/91101416198.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/creo_parametric_4._0_book.pdfIn PDF document text
    • http://votasaze.rf.gd/motarodat.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/various_sustainability_reporting_framework.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 5448 bytes
SHA-256: d2ccd9b506896368b2b2d2771bdae2fe2ea5bdca39c7e143254bcc34ad04b429
font_01_sfnt_off000180cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CC 11336 bytes
SHA-256: 0233497cb4e57e8a268793cefce4117a352b80cf07731f28216da9d6c5d1918a

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