Malicious PDF — malware analysis report

Static analysis result for SHA-256 602a978d322b381f…

MALICIOUS

PDF

76.2 KB Created: 2021-06-05 10:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 447c3229a813e714364fee4f42072c73 SHA-1: e9cea8d749c9c224876296b6262320202adefd7b SHA-256: 602a978d322b381ff7d5a09bb1c92435f400bee183f797012850193ce4732d38
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution, masquerading as a Facebook video converter. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=facebook+video++online+converter PDF link annotation
    • https://jutikuned.weebly.com/uploads/1/3/5/9/135966087/popijutatimipomoxidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_60379407e849a.pdfIn PDF document text
    • https://zafuzumu.weebly.com/uploads/1/3/4/6/134674349/simijadulexiko.pdfIn PDF document text
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/4425474.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/fawevejezanukiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_601b97226bb6d.pdfIn PDF document text
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/neravemorujuvori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_60106d4c940e9.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/mafonofi.pdfIn PDF document text
    • https://pobexapuze.weebly.com/uploads/1/3/0/7/130740180/3158794.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/wilezemuwu_dimodafodurip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578127/sopa_de_letras_elementos_quimicos_resuelta.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/lg_direct_drive_dishwasher_error_codes_ae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda38a20-b672-4b60-8455-65005e139503/98642828513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ca84fe-ef60-40fe-8e98-bc7124aad6a7/91159200325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398c6518-f4c9-4a4d-bab5-1cbca92092bf/3427357224.pdfIn PDF document text
    • http://wotesova.pbworks.com/w/file/fetch/144652290/fadupidobemeboseme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49220f9b-2908-41a0-9a36-db041f023dac/fabose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad5d99c-e769-4921-b52f-bb6d9a29ad96/14480876891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7ad43f-c8d7-43cd-8c83-50998d39d026/how_to_prepare_mamas_flat_stomach_tea.pdfIn 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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 4976 bytes
SHA-256: 1bd9556671b493a8d8211bc672b7a5becd3604e5c41a334fd22cb1f3961e5e05
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10976 bytes
SHA-256: 9f5241d69ac4134ad87291bdecd77052b5636fba7849f0fb152a92b496063c3c