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)
MD5: 1ff78682d1b67bcf3e8950eea08cf039 SHA-1: 80e4319375887a0d79647fdc8146ea8d1396526c SHA-256: 6bff98e391ebfcf858666b56ec83d6d4b3a14a7cb70a1875996d9564ad139b63
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary purpose of directing users to download potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to exploit users through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
    • http://santaparker.store/6331740271882x7c.pdf
    • http://buyfastedcircle.xyz/is_there_an_extension_for_drivers_license_renewal_in_pak974u.pdf
    • http://obzorov.site/woluwusofulipisi9c05.pdf
    • https://cdn.sqhk.co/xilasexiki/Cjgjigh/98686160294.pdf
    • https://cdn.sqhk.co/wixadigizal/bhithb5/vuzalifapefezapig.pdf
    • https://cdn.sqhk.co/nedabuke/idhhigd/29871033560.pdf
    • http://idealica-itufficiale.website/85744186858uugjk.pdf
    • http://epaytds.xyz/lagu_coldplay_fix_you_covera2x5m.pdf
    • https://cdn.sqhk.co/sefibenip/ajfEgiV/business_strategy_interview_questions_answers.pdf
    • http://vujukotigenali.22web.org/wshh_questions_season_2_episode_3_uncut.pdf
    • https://cdn.sqhk.co/vekuzajomugi/jgj9xv5/52239479910.pdf
    • https://cdn.sqhk.co/furugilenu/ilifLjj/define_the_managerial_revolution.pdf
    • https://cdn.sqhk.co/kuxixixixi/3ptD1je/gufebugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_e570017b060442ec8d527693f0389e7a.pdf?index=true
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_bbf5b170fa9d455b9da24727f3081f51.pdf?index=true
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9b3baa090ef34241bcd57c0c75617f41.pdf?index=true
    • http://lamiredej.epizy.com/archeage_skill_guide.pdf
    • https://s3.amazonaws.com/daraniwekamidir/worksheet_feeling_and_emotion.pdf
    • http://takugiwem.rf.gd/kodizojizitogotamuraro.pdf
    • https://s3.amazonaws.com/bepukuba/kuwokinigeg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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