Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f01aaf867b416e8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 16:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 719c07e452032362264839998a65c7b3 SHA-1: 1c56fca537d6fd2051ae3117f79f71ad5a98da73 SHA-256: 0f01aaf867b416e8e588335262240c52bb14b50f049d459b01c061db704b8bbe
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 0.9998

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
  • 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://crophysi.ru/wix?keyword=a+modest+proposal+study+questions+answers PDF link annotation
    • http://lelekelosutov.getenjoyment.net/epson_workforce_600.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/wexowekukebesinolir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_643c99067e9749dbb2ce5e79c1190202.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/2154205237.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_511a30a3fb4d4e4aa9eaabb8b86886e0.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/arm_cortex_a8_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c13edb-3465-4f83-bab8-4fb99429be00/keeper_of_the_lost_cities_book_1_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3a32d4-b6fa-4ca5-a079-8f7acc317104/27163547536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a39290-08f3-4efa-b701-022379740d75/tokyo_ghoul_re_anime_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48da7677-b3eb-4fdc-9f6f-4bb09d346670/comentario_biblico_macarthur_apocalipsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba69ac5-205e-4e73-939f-8843b8bb5ef7/clasificacion_de_cuentas_contables_basicas.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/autogenic_drainage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6a00bc-eaf1-4d93-81cd-81ef3b34ce51/9739253857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b672fbb-0a6c-46e1-a139-3cd889f3d5f1/bubezumuliju.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_0ddca92db40140dba93ec2cad313dad6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e4a4a0-23f4-49e6-9c3d-a3fd8a5b2073/guxozupilupunasov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd315130-4adc-4b5c-af71-05c6ea163d87/97518023949.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_931c675cbac64bf6b1d746b6e6f1689e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/037c99b7-f53e-4eae-8e28-0a8bad986683/74782733466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f4ca2c-54f5-4a54-b242-72f5217b4d40/37189982690.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_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5416 bytes
SHA-256: 7f0685c2bbc4245ac33df2b56cac4052ef72377dc04eb343099a4866802ebd59
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10620 bytes
SHA-256: c23abd37c302c2527e96c54133da08d350a1ea72190293e0722387ae4ef07b11