Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d5df3b2fadbee1…

MALICIOUS

PDF

78.0 KB Created: 2021-01-23 13:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1629599aabd82c7081dda020d685a492 SHA-1: b00462da33c31b534ca6f119dc23bbc61a279e5f SHA-256: e3d5df3b2fadbee1824cb91f5fcfc3fb11ca4dd779cb48063634e8931f34a0be
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/wb?keyword=top%20pop%20rock%20music%202019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5ffb3eb42d851.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/hgjcmgf/62735194634.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/heGKjf2/ringtones_samsung_galaxy_s7_edge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fca891c8d5f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3e0cb3fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/ehaEthh/best_deals_on_labor_day_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/hhPhgig/into_the_dead_2_switch_price.pdfIn PDF document text
    • https://site-1177498.mozfiles.com/files/1177498/kenavenonidugopunovapixud.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/Nigjdha/elements_of_art_examples_photography.pdfIn PDF document text
    • https://site-1178426.mozfiles.com/files/1178426/75467085430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_600799fccd47d.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/5177298090.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/ant_radio_service_delete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafabumawo.rf.gd/64303725725.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/1_delinquent_on_credit_report.pdfIn PDF document text
    • http://suginuzebaluwom.rf.gd/lead_poisoning_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/30055125486.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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 5332 bytes
SHA-256: 94e11a69e86acb30913379fe3eeef299b0e279480c4c32760598ca96144ab5df
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 11580 bytes
SHA-256: ac9589bc024ebfde64dc9616ee1ae4200b5da844d2f3045431575d77d82320cd

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