Malicious PDF — malware analysis report

Static analysis result for SHA-256 8424b3890612fae4…

MALICIOUS

PDF

68.9 KB Created: 2021-02-05 06:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 93b836ddbe80b18730fd98bd36df3626 SHA-1: dbd2b3063b13f8bb362959066196d85987731356 SHA-256: 8424b3890612fae484c91806dba74c7194efcbfbbea664cebfbd487af014a795
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=ethics+445+final+exam+answers+2018 PDF link annotation
    • http://boviriso.22web.org/parent_brag_sheet_naviance.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/c1MDCyO/no_crop_for_instagram_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_600e07fbe1b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fd9c01d20cd6.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/bLUiagg/evolutionary_theory_of_sleep_author.pdfIn PDF document text
    • https://cdn.sqhk.co/zekoparan/ajdjayu/jitirifo.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/qiigejh/80602345894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/cyberghost_secure_vpn.pdfIn PDF document text
    • http://xigesema.epizy.com/adaptation_worksheet.pdfIn PDF document text
    • http://pimorem.epizy.com/fowuduwubolar.pdfIn PDF document text
    • http://letulirabe.epizy.com/mabuz.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/juteraravikezerop.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/formatting_sql_code_online.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_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 5972 bytes
SHA-256: 1e229e281c8e011dfeda46c9441c3768487bc4e9e9e9bed47bb9d44cd81c2f35
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 10256 bytes
SHA-256: 14f2d26eb9b8b61b7b9b210894b6778493dd2438f28a149255ecdaa01f941a62

Open this report in the interactive analyzer, or submit your own file for analysis.