Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bff98e391ebfcf8…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 07:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1ff78682d1b67bcf3e8950eea08cf039 SHA-1: 80e4319375887a0d79647fdc8146ea8d1396526c SHA-256: 6bff98e391ebfcf858666b56ec83d6d4b3a14a7cb70a1875996d9564ad139b63
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the embedded links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=algorithms+and+data+structures+mit+pdf PDF link annotation
    • http://santaparker.store/6331740271882x7c.pdfIn PDF document text
    • http://buyfastedcircle.xyz/is_there_an_extension_for_drivers_license_renewal_in_pak974u.pdfIn PDF document text
    • http://obzorov.site/woluwusofulipisi9c05.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/Cjgjigh/98686160294.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/bhithb5/vuzalifapefezapig.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/worksheet_feeling_and_emotion.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/idhhigd/29871033560.pdfIn PDF document text
    • http://idealica-itufficiale.website/85744186858uugjk.pdfIn PDF document text
    • http://epaytds.xyz/lagu_coldplay_fix_you_covera2x5m.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/ajfEgiV/business_strategy_interview_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/kuwokinigeg.pdfIn PDF document text
    • http://vujukotigenali.22web.org/wshh_questions_season_2_episode_3_uncut.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/jgj9xv5/52239479910.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/ilifLjj/define_the_managerial_revolution.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/3ptD1je/gufebugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_e570017b060442ec8d527693f0389e7a.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_bbf5b170fa9d455b9da24727f3081f51.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9b3baa090ef34241bcd57c0c75617f41.pdf?index=trueIn PDF document text
    • http://lamiredej.epizy.com/archeage_skill_guide.pdfIn PDF document text
    • http://takugiwem.rf.gd/kodizojizitogotamuraro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5440 bytes
SHA-256: 5bc4d5e09a4544e8002c9e7fca97dbcc1045251bbb5bca0940242a181fab01ff
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 11776 bytes
SHA-256: ee004d898416131dab56d1578ab086b948ea9933f15b62cc17d14bc0a7b2d52b
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e