Malicious PDF — malware analysis report

Static analysis result for SHA-256 4259981828e401ef…

MALICIOUS

PDF

88.1 KB Created: 2021-06-02 21:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8712e12da2b75ab35bc5c3a84580fe77 SHA-1: edbabd803d3794e6c857e9031724f505a813dfd0 SHA-256: 4259981828e401efb67aed487a1c7ba3f4e339557340f518fccd9ecb02e81998
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 0.9998

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://druttle.ru/123?utm_term=cost+of+capital+problems+and+answers+pdf PDF link annotation
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/zaperijesamud.pdfIn PDF document text
    • https://lutilaxo.weebly.com/uploads/1/3/4/5/134599665/341cc8f40ed.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/7e2a84.pdfIn PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/pokexelenusulemimi.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/1862275.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/sufiredikudedagotata.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/3475646.pdfIn PDF document text
    • https://noxotikevive.weebly.com/uploads/1/3/4/7/134751739/rimameb-sejebuberel-figiniwobalaje-nepalidemulu.pdfIn PDF document text
    • https://tozifurijusewo.weebly.com/uploads/1/3/4/8/134850353/gedotofabutaxe_jekelenato.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/fexebipitixini.pdfIn PDF document text
    • https://fosozenasavo.weebly.com/uploads/1/3/4/8/134889966/fuxezixedeto-sipimetukilu-kikeganefino-lexikuzosugi.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/welasusoxatasom.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/59cf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e472d016-1890-4996-ac33-024a202ac6ee/medieval_2_total_war_mods_twcenter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a14b912-548b-4748-b500-1e0cd21d13e9/what_is_a_line_called_in_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844f77d3-0e2e-4149-ac77-5dbfc2b15cf8/how_to_clean_a_weber_spirit_2_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823f096a-4017-4b04-a0f2-004034684269/big_issues_in_higher_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac74d82-5e66-4133-8e08-54bfb7f2bbd5/tuvoretasusowite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357d55a7-e65b-451c-a5e1-dc4c91570673/wetilamisifusananalenafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7c6b26-93d2-4445-a3de-a74362c4be53/contact_stiffness_ls_dyna.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_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 5440 bytes
SHA-256: eba9fe4be69368cfbdd7aa35a63c5958aca8941d4ea0665dff883a39217f9a23
font_01_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 11508 bytes
SHA-256: 2815e738bba68c70c67bd4b8f3ea0fa1d0f823854ed3aa379ea75977d66d6b9b

Open this report in the interactive analyzer, or submit your own file for analysis.