Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9e309cbb4c8b73…

MALICIOUS

PDF

77.6 KB Created: 2021-05-03 07:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90a1d2e44167e0e097f0a2f1296b39fd SHA-1: a4057d44758fcf85e8d970023a8744f5ad9892ee SHA-256: db9e309cbb4c8b73850c3bdd68679bae798b2bd26f04d0458335b912c373a9e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://kuzutuzo.ru/strik?utm_term=are+there+books+omitted+from+the+bible
    • http://sezuxopi.22web.org/7611221892.pdf
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/getelefir_belos_mupew.pdf
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/f7455.pdf
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60164db6322bc.pdf
    • https://cdn-cms.f-static.net/uploads/4461229/normal_5fd82bd94c50f.pdf
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/f249d.pdf
    • https://rukururage.weebly.com/uploads/1/3/0/9/130968917/kaporaw.pdf
    • https://vavimogazoru.weebly.com/uploads/1/3/5/9/135968849/0a2e92e.pdf
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/746060.pdf
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/mipigawaneziwog.pdf
    • http://tuvolabuzibode.iblogger.org/vixotenitexi.pdf
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/1382896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_65b1557b5f4a409f9c972cf84ee76de4.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_4ac6b776076f4879bb07a6951b5dd2c4.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_823f5570afec41eeb44d869dafe01524.pdf?index=true
    • http://lanurifif.rf.gd/wedding_guest_list_template_excel.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f0f13177ef774b85a278f3eb1c1b57af.pdf?index=true
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_f2a345dabc1848768339e31f6c962979.pdf?index=true
    • http://gazavitiji.epizy.com/blue_christmas_sheet_music_free.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_cf19c356757e4a10997beaf872bc7c73.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_bf4be4cc704448f28386481cdf172b5a.pdf?index=true
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_183631e256654742b592326ceb9344fd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cc.bin
00c1e38d514eeb974dd973e272ccb7db56434e53d53ea9adc69a678e7e52e975		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 5128 bytes
font_01_sfnt_off00010311.bin
ba457b4a3a5a350f3a190943083c0a8a8db1a3720ae286b688febea4aa75fb02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 11184 bytes

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