Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d818998f55be95f…

MALICIOUS

PDF

88.4 KB Created: 2021-03-22 23:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a35207ccc65b19ac9f55ac6406d7a4 SHA-1: 75ca8ff555f90f9867c7c38098666ff9499d4c1c SHA-256: 9d818998f55be95f9ead3af38b2fff3b1fccf829aff159ccbafcb16bbeaacb47
166 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many pointing to disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dugedepap.ru/award?keyword=prevencion+de+anorexia+y+bulimia+en+adolescentes+pdf
    • http://lubenoredeji.mypressonline.com/5501846621.pdf
    • https://cdn-cms.f-static.net/uploads/4384046/normal_60416205dcd87.pdf
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5feb3329c5537.pdf
    • https://woviwawegar.weebly.com/uploads/1/3/4/3/134319486/4225069.pdf
    • http://vazukororupob.22web.org/satir_iceberg_model_explained.pdf
    • http://puwinowelin.medianewsonline.com/descargar_biblioteca_del_evangelio_sud.pdf
    • https://cdn.sqhk.co/nezazexador/aiahdhe/merge_car_mod_apk_android_1.pdf
    • http://dolobovofozuz.22web.org/book_of_secrets_movie_cast.pdf
    • https://static.s123-cdn-static.com/uploads/4474211/normal_5fefc2326da92.pdf
    • https://cdn.sqhk.co/waxolulum/ghhihbB/murder_hornet_size_vs_bee.pdf
    • http://bixekakazozerol.mywebcommunity.org/nowisopigikurodonowolifu.pdf
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/nodal-pepedufimoge-fimigiz-velofegetexenuz.pdf
    • https://cdn-cms.f-static.net/uploads/4471238/normal_6027306fdffac.pdf
    • https://cdn-cms.f-static.net/uploads/4464710/normal_601baea67d042.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/7308745.pdf
    • https://cdn.sqhk.co/guzunilepin/iAjgSNn/62958006031.pdf
    • https://cdn.sqhk.co/nemazuwigumo/Zha1hfw/70217044952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vexabimumemig.atwebpages.com/dinadesixezupup.pdf
    • http://bowegasobufur.myartsonline.com/enzima_aspartato_aminotransferasa.pdf
    • http://milodip.epizy.com/8964227593.pdf
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_f4aa41f4c6034d3aab912238544bca3e.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_1894594a25c64a04b5eaf779556df8d0.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_b4c8a9ed75a5476a8d4b2fd128e43100.pdf?index=true
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_71b58e03e40a495e8bdd69cec7e9a7a5.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_off000115e5.bin
07701f988b0187d3a0c4b11d6a6eaf66c2b22e6e5c74d687dced323ba92c7075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 5672 bytes
font_01_sfnt_off00012926.bin
e3de5ba0f426092e21059c6bed12936727e5dc947fdec95f5b5a4a00dd31e2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 12524 bytes

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