Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f18a2f89f3b1e8…

MALICIOUS

PDF

82.3 KB Created: 2021-05-31 11:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58f0ad508dfb7b5add0acb9eeaaae510 SHA-1: 52f20117fe1b7f93ddf159ff97e754199ef9d0ac SHA-256: 24f18a2f89f3b1e8e88c05399b251801f70a4035ce2a22da88df5a654b770e91
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=acs+organic+chemistry+final+exam+study+guide PDF link annotation
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/9682289.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5ff03b172406e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019973e21082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_605ba4bb99542.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/2601123.pdfIn PDF document text
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/nivebagavu_pisabufotusowo_jutatab_jelumise.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/nokofedo.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/dozonawubodix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_600ab35e47dfe.pdfIn PDF document text
    • https://jotopivazujofid.weebly.com/uploads/1/3/4/8/134881135/6032907.pdfIn PDF document text
    • https://welogodeketi.weebly.com/uploads/1/3/5/3/135326703/4894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_60238f78b2a19.pdfIn PDF document text
    • https://tuganokume.weebly.com/uploads/1/3/1/4/131452880/piwelokuniju_mefiz_worijafig_jususalumolud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_6052d55e95d91.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/6035475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fe245b3038ec.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/e6aa3497-64b2-46b8-9281-5ab50d588537/should_i_read_the_dark_tower_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5874e1f-8573-4136-8834-1a5ed393bd3b/how_to_write_a_macro_in_excel_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c66e3b2-df0d-43db-85b4-d46ae597abdb/3430941933.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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 5596 bytes
SHA-256: 258ae7e6e00eeea6f2d2a34e7cdbf7f8c32c7f8783e436cb0c8d31f3052a4d86
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 11368 bytes
SHA-256: f8ebea3c978c1db946a17fa65befecc3bfe0764f305a5ffccb8f97739fc2749a

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