Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4867481ac9b490…

MALICIOUS

PDF

76.3 KB Created: 2021-04-27 19:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3681b6e6d0985f26ca0670466417e8a5 SHA-1: 5990a2645884f5d984b42d1224fd76be4c1493f5 SHA-256: 8b4867481ac9b490bb46f951272aa85cde92c87aaef3e9b6e53a383be8e229d2
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://jumiwimov.ru/strik?utm_term=can+cortisone+shot+give+you+a+headache PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449419/normal_60010f559a5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_600afa96bd61d.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/baxasubasixewawipigibaiadid.pdfIn PDF document text
    • http://jewlgems.com/ps3_controller_battery_price0cftz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_605ad31d3f45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_602e39e68078a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fda664192b01.pdfIn PDF document text
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/34d83fc.pdfIn PDF document text
    • http://ritefajitexu.scienceontheweb.net/toxoplasmosis_signos_y_sintomas.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/sikalege.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/798f7f577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_606b7b2e2d8de.pdfIn PDF document text
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/fibadegigako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fd295db411da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fde3d1b59b8b.pdfIn PDF document text
    • https://xiwesawubofu.weebly.com/uploads/1/3/4/2/134265581/maxik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokozod.myartsonline.com/gastrocnemius_strain_rehab.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/jofowefobuga.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_c985e764f8c0423c85841742d0df41b1.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_8bd1483c80944025869c618dcf6b1ada.pdf?index=trueIn 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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5236 bytes
SHA-256: 951ed425887883158a4bd32078605507ffad509b0c4d97b843f7c50bd8f42f5d
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10540 bytes
SHA-256: 34242e52904c9727c733ebc7f60fa747f4308ad3ad9eb4f64f962f3078fba620

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