Malicious PDF — malware analysis report

Static analysis result for SHA-256 100754c8ff965180…

MALICIOUS

PDF

88.7 KB Created: 2021-03-30 13:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 13bc8bf14df3ef8c6a6852d309dd142b SHA-1: 1999ad6a88c6fd6d392036c91d34c1bb159d28df SHA-256: 100754c8ff9651800dd9b4755e41e2bbdf781f58ab5a63817155f3e7a1ee56a0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or link farm operation. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely to redirect users to malicious or phishing sites. The document body, though heavily obfuscated, appears to be a lure for 'classification of plants worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=classification+of+plants+worksheet PDF link annotation
    • https://dukikabapesudux.weebly.com/uploads/1/3/4/1/134108868/tokajerugowajeku.pdfIn PDF document text
    • https://gexuxufe.weebly.com/uploads/1/3/1/4/131406387/2d15f.pdfIn PDF document text
    • http://madewithsunshine.com/31328865299gofc5.pdfIn PDF document text
    • http://justiciaforjustice.com/98537715882064z.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/188029b9def57.pdfIn PDF document text
    • http://milanbeach.fun/72928331907tyury.pdfIn PDF document text
    • http://greatmasters.biz/ziwumejalegilev6vm5.pdfIn PDF document text
    • http://3bki.ru/how_to_start_using_python_on_windows7uxaa.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/9e738657-02d4-4bad-90a3-34a1e114b1ae/tricking_and_tripping.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_7d08d4fcf6ee467d856dffeb7c01b714.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_70b4552ac67041da993fb0240648634e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/aefe_mage_formation_continue.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_c33a0b79a75545199af55fb084e68cf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/018f226c-1ddb-4db3-8979-71bee646f39b/fowadiwimanazijamojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f838d2e-55d4-44e9-b82e-7a1529d8dac0/vexetajivofa.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/94837520028.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/vipebagafojatanogitu.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_600ac821edc0476daf13ac2b4b6f449d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fd5feb-66f4-447c-b253-cfbb78deb267/zizexunoruseligup.pdfIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_ef42628be83841ada4cae453125b83d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ca9f2f-fcd5-442d-b435-4ca8857f88f5/kane_chronicles_netflix_movie.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_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 5164 bytes
SHA-256: f0782a25af9b9d553ecebff376ee9c7259d56e9afbbe417e81f1279cff0a8b56
font_01_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 10440 bytes
SHA-256: 89a1f43485c97e7ab00201eb0cacdac77a77f28e1588373360cd492170a2da47