Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9277953c91a65f…

MALICIOUS

PDF

81.9 KB Created: 2021-06-04 21:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4c7b8c0f4ccb8f30751736d5453c9e45 SHA-1: 533fecbc4bee63e73985c9846dff77c64bacfb80 SHA-256: 8e9277953c91a65fa74380835993642ed9d5080b6a48241d54e870df8a518041
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=in+any+shape+or+form+francais PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401515/normal_5ff46e7ebefdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_601db469c1bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_603012fc36c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_60397e63a4a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_603409554084a.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/8432022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_606e7885a3773.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/ec844ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60602ee4ac0b0.pdfIn PDF document text
    • https://mumevifovamix.weebly.com/uploads/1/3/4/4/134486033/darosawoves-xifuwamogo.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/bodopip_biwikaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_6014cef4900c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485813/normal_5fee47713e15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601e67d82c743.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/16dee6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffbc85b82b86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f68a4ef-3d14-47f5-a789-ecc034ea6617/what_were_the_four_early_civilizations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91237c5-b0e7-4afe-af31-415703a06d1c/how_to_write_a_letter_of_recommendation_for_student_teacher.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144522720/ejercicios_de_fracciones_homogeneas_para_tercer_grado_de_primaria.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/dicionrio_de_rimas_da_lngua_portuguesa.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/how_did_catwoman_get_her_powers_in_batman_returns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5affb17-a44b-47e4-a003-8aac9affdf93/94122346386.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/faceapp_full_version_free_apk.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_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 5260 bytes
SHA-256: 213f00b55ec3e1655e6500bf537ac94be19a1599e3ddd2cfe12c05e725d978f0
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 12732 bytes
SHA-256: 5ebb72a7115a3f8cddf3c1c71bed49e6329d7da67b020be90fe41e9f1bb6c4e0