Malicious PDF — malware analysis report

Static analysis result for SHA-256 f404db62cebc7030…

MALICIOUS

PDF

80.3 KB Created: 2021-06-04 21:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ac85a1ac07f954abbd33c8e0533c20d4 SHA-1: ca0bf7511053c7b5eaee02873fc0f4ec42e3a982 SHA-256: f404db62cebc70304067c5e40e58737063423c2d8b9e3f71939a359eb3c081bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a significant number pointing to disposable hosting services, indicating a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded links and the PDF structure suggest an attempt to redirect users to potentially harmful external sites.

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://cructi.ru/pbw?utm_term=sri+suktam+16+mantra+pdf+kannada PDF link annotation
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/0e6c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_604b051715823.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/daa93e692159379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_605638eb4ce57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fc75480d990c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/f/8_snf_veri_analizi_test_zml_sorular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2292346c-7ea9-409a-aff3-8f2ef4c9a88e/2238720325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6110cfb6-944a-4e6a-baa4-f9bf53ee4336/venstar_t2800_screen_blank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ca1083-44de-4f20-a467-3d463bcf0697/kifadipibuwerelowa.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/multiple_choice_questions_on_atomic_physics.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144613104/clasificacion_de_paralelogramos_segun_sus_angulos.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/56919630235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cc0135-cee7-45c0-a30c-4ed4ea9d9ded/product_structure_tree_of_fan.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144423285/tolegogamumizewajiwa.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144554691/32877444835.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
    • 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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5528 bytes
SHA-256: a6e0ca89c31b9286e6bbeee43a8a9edf08e7d0329839da2a97a1e8772f8ee802
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11992 bytes
SHA-256: afc522fd5c076319626ef8a6215f82c443a07dd47953f66d5a6a83a4e5428b92
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16228 bytes
SHA-256: afa59a7050191751afc183604621ecf8f9c9fc73c5073ac769054d518c8c9901

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