Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e7d4931eaf591b…

MALICIOUS

PDF

84.9 KB Created: 2021-05-11 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118b9e875261bfa0b81df8e4f1d8b0dd SHA-1: eecc4e57f4046ab0d0d0625016cc0a3a9e40d939 SHA-256: 18e7d4931eaf591be2b540196336a65ea28a6f6fb5b2bc2176f8b79bb6c7c146
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=formato+de+mantenimiento+preventivo+y+correctivo+de+computadoras
    • http://juligum.22web.org/cawdor_gang_cards.pdf
    • http://pevewoxoxup.scienceontheweb.net/57972027170.pdf
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/xevozojiwezaxug.pdf
    • http://bowawusugipabes.22web.org/juzirukibuwupo.pdf
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/foginojot-loredoroz.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/vuduxuwavone_rodatinot.pdf
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/8cdd342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_4d6ce6c6ff0d4296b50beeed66ddb204.pdf?index=true
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_d81b7bb605954829a17028b90343d238.pdf?index=true
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_52b8604fe9f84a378523a245f286b4cc.pdf?index=true
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_df51f83cb07441e8be596c0c58df6e4b.pdf?index=true
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_f5977ca11b3a4090b16a11ffe2fc2432.pdf?index=true
    • http://wiratobut.rf.gd/15453747550.pdf
    • http://juborekif.atwebpages.com/kidonirelasatijomuxilex.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_41374f584c85415699df80fef3044aab.pdf?index=true
    • http://vinumokoz.epizy.com/ulysses_poem_summary_in_simple_english.pdf
    • http://rujidafedisezu.atwebpages.com/how_to_help_child_overcome_fear_of_death.pdf
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_f7f6950ea41a4985bf04c135195ed343.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_c8515ebf6f3741d6b80c1c57316fcc9d.pdf?index=true
    • https://s3.amazonaws.com/genedonapubefe/share_certificate_template_online.pdf
    • https://s3.amazonaws.com/nowokil/communism_and_capitalism_dbq_answers.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_70b30934622442719dede09e5532146b.pdf?index=true
    • http://pemadewuxifanu.epizy.com/kotedinubadi.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5f.bin
dae29f2313ffc3855c8149b7bdcdb0916a36a337d4e2c81dd11b93c5da8edf8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 5188 bytes
font_01_sfnt_off000110ef.bin
1e21b1a4528d5d5e6a5cf56813f38c8916795d39aaf1624e6ef22fb279d94238
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 11960 bytes
font_02_sfnt_off0001376b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 4324 bytes