Malicious PDF — malware analysis report

Static analysis result for SHA-256 40165499b9d8c411…

MALICIOUS

PDF

79.5 KB Created: 2021-03-10 11:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00d3d0f6b54207d162560a9b37b3406a SHA-1: 82fb99ed0670939c6254ef4ec463bd258ae02d70 SHA-256: 40165499b9d8c411117907a7caae3e3c54e287c73023f9bbda29502f83704f99
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URL points to a known malicious redirector, suggesting an attempt to lead the user to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=are%20all%20panasonic%20dect%206.0%20phones%20compatible In PDF document text
    • https://cdn.sqhk.co/jebozibiru/8vqgrjd/army_clash_mod_apk_2._4.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/dfbzUdx/incredible_jack_jumping_running_offline_games.pdfIn PDF document text
    • http://juilopkiretlo.ru/899965340224btwd.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jdijijd/42404243657.pdfIn PDF document text
    • http://wacc-cat.org/frank_fabozzi_fixed_income_analysiswhrd8.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/rhihhgg/pokemon_tower_defense_2_hacked_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jxijjgm/zupokogeladixijipipefowo.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/gXhahcJ/52157952281.pdfIn PDF document text
    • http://lngcliente.com/fraction_comparison_worksheets_grade_49w93f.pdfIn PDF document text
    • http://front-glass.website/xinugovae9q03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/vazipezixim.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/commercial_loan_officer_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/fases_da_doena_de_alzheimer.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/the_boy_in_the_striped_pyjamas_summary_movie.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_70a4eb3cb202409284cd53f722cd741c.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_8c7a323a165444a6afc2d546ec05c620.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_1822da9d9704411fab942eec5a8a1efe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/cetoprofeno_eurofarma_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/hse_risk_assessment_template_schools.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_431519fe7d1f4e6ca340b0ce5163fc7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/bobsleigh_sport_information.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_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 5768 bytes
SHA-256: b515b681e7c88a19aa018220d92a29fd138953011915d3ba8ec7e57017ec72e1
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 11204 bytes
SHA-256: 402697ce8b2539921458f118e5813f48e4c313a43c6eb18fb9d034eb4cb87892

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