Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd590ebfb91cc1fa…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 08:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6c8e5d20ebca4819f4a00c8fa7622021 SHA-1: 1fa1e5e8618664d4901bad70c7cafd2c496d65fe SHA-256: cd590ebfb91cc1fad65a6173589b974f01db2ada23eef89f07c499d1776776cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

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://botokaw.ru/award?keyword=cfa+level+3+book+1+pdf PDF link annotation
    • http://perevod24-card2card.site/are_green_egg_grills_worth_the_moneyc26nu.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/kevedow_kedezu_vajupuxajawux.pdfIn PDF document text
    • http://manybigs.space/voxuvunifavunimelafarexj672y.pdfIn PDF document text
    • http://aazzzry.space/anybody_can_dance_20n8nk.pdfIn PDF document text
    • http://trenolgia.buzz/juegos_hombres_y_mujeresdeo9y.pdfIn PDF document text
    • https://juxosejuw.weebly.com/uploads/1/3/4/4/134481686/6604426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_df86cfe7427e4fb19998cc2ca696f06f.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_3755c076737a45bda536a4c959a758c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5796d6a6-efe9-4256-9ad2-bdc322117811/white_christmas_tree_decorations.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_c472929d850b42fb820f063efd8414a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30418bb-cd01-453d-8e22-a4c581dc6a5d/12060122670.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_e1c83783a6bf4fc6a62a2c8011547463.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09a97cb-8033-4108-8338-b2bb200f5313/skyrim_special_edition_how_to_manually_install_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/pudisozosuzilo.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/14381078315.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/napogalubugejutoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887d111b-43ef-478e-a9a0-ba4e7e52ee64/transformational_leadership_examples_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/14458438755.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/is_python_more_useful_than_java.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 5144 bytes
SHA-256: c7f6f47a3a4d272685c8256e969317f9901f4796ce8b3d266c6c56964b17345c
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 12432 bytes
SHA-256: cf6a7f430ca4da3b5d3544ee30128e26081b7004473fd12c43cda818c276aeb6

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