Malicious PDF — malware analysis report

Static analysis result for SHA-256 115bcac5b7f7b682…

MALICIOUS

PDF

86.4 KB Created: 2021-03-21 04:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8e7fb0699e45953922d7840e35c9dc3c SHA-1: a6a567698e59cfa20de615a76966f162a2b131e0 SHA-256: 115bcac5b7f7b68222dd1ae5e6f0ddb073c7014ec99084cb20ec17929bf577af
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://maypoin.ru/award?keyword=descargar+diccionario+catalan+castellano+pdf PDF link annotation
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/nibaduvozomezabel.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/hcjbo98/mikiginaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/gbzjOyt/linoxuwizemizoxufewavus.pdfIn PDF document text
    • https://wevinosoz.weebly.com/uploads/1/3/4/4/134444327/wopafoju_kefiroz.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/gghiibD/25730095337.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jgfhjSE/pocket_watch_repairs_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494677/normal_5fda36a1cabf0.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/romanesque_architecture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fd91e09a394d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_604d05d42e295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6041a6a21128e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefofezas.rf.gd/anticonceptivos_de_emergencia.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_22a1fb42cc2542f4b91388a8d337cd10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/judakorutitifanejij.pdfIn PDF document text
    • http://gaxezakowe.epizy.com/dododekifiva.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_e3a7ff06caf54c0680abdf9c22ade960.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/covalent_bond_questions_and_answers_gcse.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_13f7a493b93740248d389a17ff8ca03b.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_239034c32b924a0786053315fa4289bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/waterfall_project_management_methodology_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/chlor_rid_data_sheet.pdfIn PDF document text
    • http://punafifa.rf.gd/kubizub.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/44962621877.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/19037865034.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_f0ce084b29bb431bafeb7b04d04a5807.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 5320 bytes
SHA-256: 586c334d65adc1edcb6602508b13f6b6967e8a0ffde7ab43763698e6ad88db75
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 13576 bytes
SHA-256: bda5105052e82bd6a759e4f6960fb2821f4265777ab81ae49381677d4d3d3c44
font_02_sfnt_off0001366f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72