Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa739d3b77bb6cd…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 05:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d0e86fcf7e38e17d57c357211222f92b SHA-1: 72875e41d8b5041c742800f9a0f64883428299d3 SHA-256: dfa739d3b77bb6cd4c811bcafa5ada229a3de6e631e9e3877731c88bd7a65cec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/wb?keyword=imagenes%20de%20rostros%20para%20dibujar%20a%20lapiz%20faciles PDF link annotation
    • https://cdn.sqhk.co/fiwujumejuf/4OhhhhR/63474794759.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/bDiawdH/ezpay_solon_schools.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/1caa3f023.pdfIn PDF document text
    • http://marelosolato.iblogger.org/51342820700.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/jP2gcEm/game_studio_creator_apk_mod.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/f3b7a93df294889.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/bgeihF5/poughkeepsie_killer_edward_carver.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/kjhczGY/archer_adventure_island.pdfIn PDF document text
    • http://fakafegixir.iblogger.org/gtd_system_guides.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/jovekus/avatar_2_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/eclipse_javadoc_template.pdfIn PDF document text
    • http://zisafaziga.epizy.com/physics_notes_form_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/aashiqui_movie_song_wapking.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/bharti_airtel_annual_report_2016-_17.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 5676 bytes
SHA-256: 2a51f6137b7073b1193d88d43eeec57fbc6760a79f5261e8085c45ab655b4ca7
font_01_sfnt_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10080 bytes
SHA-256: 4b7d4230140c90ea29d99bfb72c1e4de7434729a596ed1a5e1d6ab58dac0ce84
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 6128 bytes
SHA-256: 82caf478ec356c1625b799fe5773cae3dda684b4d845119e6c835c64458f2ead

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