Malicious PDF — malware analysis report

Static analysis result for SHA-256 a458b88023f2931c…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 07:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2395f6261c9b9b71e40d4f17ac6e8b9e SHA-1: fa4fea92bcde84113f11824b9a934d208eaa2775 SHA-256: a458b88023f2931c1fee018ffcf20d7aa99357e944c1ad6d11fe933d9a640dcd
186 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one prominent URL pointing to 'zajinet.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/strik?utm_term=chartered+financial+analyst+test+results PDF link annotation
    • http://napodosawukezob.getenjoyment.net/842089402.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/game_maker_studio_2_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/jhbtjjU/herpes_simplex_labialis_images.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/causes_and_symptoms_of_aids.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/KjbVQc3/freeway_closures_5_now.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/lullaby_of_birdland_vocal_sheet_music.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/d9f0870c-e14e-4c71-a60c-ac8a2c7af738/what_are_the_types_of_norms_in_psychological_testing.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_4e8d3fa5592048fc9a8a4b9264631321.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/proceso_de_la_investigacin_cualitativa._epistemologa_metodologa_y_aplicaciones._bautista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa91021-ee0f-4b30-b94c-9fad1735c943/white_christmas_tree_with_coloured_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f55b52-ceea-48fa-bcfb-25462489b072/rasoxela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b282bc-7b80-4038-b563-f91a55de5217/boss_dd_20_power_consumption.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_2e609f06c6ef4a0ca5d170a6cf11ecb6.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_61c1276a8af1442ca44de8c827854f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90f2b77-c733-4141-8d8c-13d3c9ab2cce/kubilofiwa.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_e857d39d1f164edd8a0101d9ebd68ee8.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_889009df6592485cbd16857aca75afff.pdf?index=trueIn 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5116 bytes
SHA-256: 7e2767c709e31c9cb8cd3c0fb5016b39c225293f5c67fae25d318676207966d5
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 11080 bytes
SHA-256: 969e32b153a05a23b91bc21c569b0ec70248ab0f83dcbb1d408431ae053b6ab3

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