Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8bbad5fd7e5924…

MALICIOUS

PDF

73.2 KB Created: 2021-04-23 21:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d9778a9004d35bbc9ac40f79185f7e92 SHA-1: b69f4868a735f8b761d13b7633a763e5100ca4c2 SHA-256: bb8bbad5fd7e5924db9e6298a3b5752ae83d8b76c28ceebc5a2bebd5e5740571
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=the+norton+anthology+of+world+literature+volume+2+shorter+fourth+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454426/normal_606540e11260b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_60260c27cf338.pdfIn PDF document text
    • http://mrt36.ru/black_tail_magazinetfs0y.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/ibjbjhB/music_id_for_roblox_savage_love.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_6008c1029d9d2.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/CI27hca/33320746992.pdfIn PDF document text
    • http://semengergel.ru/code_premium_robocraftqc6gl.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/ibjfgeI/can_i_lose_belly_fat_in_7_days.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/Gnpjjs3/87361726730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_3c5fc1386856453ba5f61a6cd904b380.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/negasuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/6671676727.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_1fd7c39386ec4647a3fdf9de4442a90b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/34314653356.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/11518679570.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/average_salary_for_network_architect.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/mabute.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/38758330260.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_5bbd0481c2e942ec9da8906db3bdc71e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/53458006422.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_7569d2a343ed4c708a43885c8180d95f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/pte_academic_writing_practice_test.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 5792 bytes
SHA-256: 0b50a45c127176197cf8cccd51cb729f4e823d3037db89b317b4c38c6d4034e2
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 12248 bytes
SHA-256: a4e54caa74c203c739ea35cd695533a8d5d79fd6a9df88ea1b606a0e1f1c7f5e

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