Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4651d717df57c9…

MALICIOUS

PDF

90.0 KB Created: 2021-03-22 23:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5145586e55c491ee39d6b4756c211c9a SHA-1: eb599cb08f2faa1d6ef75713cd4f2c0d27ad5dbb SHA-256: 9b4651d717df57c95e2f45691fe7ae298ecc8c2ded0d37b8225602e82dc5c901
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though partially garbled, suggests a lure related to movie downloads, which is consistent with phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=perdona+si+te+llamo+amor+pelicula+completa+en+espa%25C3%25B1ol+latino+descargar
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/waxorad.pdf
    • http://latencfsrt.space/samsung_js8500_hdr10yolyf.pdf
    • http://nesorus.mywebcommunity.org/how_to_turn_off_alarm_on_emerson_smartset_clock_radio.pdf
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5fd799386dbe9.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_602dc5716cd1c.pdf
    • https://cdn-cms.f-static.net/uploads/4372735/normal_602a1bbfe494b.pdf
    • http://usesalon.xyz/271051358539v02q.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_600bf3e91d7da.pdf
    • http://spainsale.pro/tajonpzeic.pdf
    • http://lnstagram-blue-badge-form.com/how_to_get_my_cdl_license_nycpn3on.pdf
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/3748090.pdf
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/dafubufu.pdf
    • https://pexegiwu.weebly.com/uploads/1/3/4/5/134526087/xemaza-mejebijubuvuk.pdf
    • http://shortsomfj.space/how_to_program_dish_remote_to_samsung_tv_without_codes2kd7p.pdf
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fff7b6305151.pdf
    • http://mirumumavetifun.mypressonline.com/sinusoidal_current.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijilesuzuxo/69094442965.pdf
    • http://ligoroxenafof.atwebpages.com/jobomixugetejiro.pdf
    • http://luzojora.atwebpages.com/511._1_case_study_of_a_child_in_english.pdf
    • https://s3.amazonaws.com/fefurorobumi/asphalt_6_adrenaline_java_free.pdf
    • https://s3.amazonaws.com/xirixepo/ps2_games_iso_for_pc_free.pdf
    • https://s3.amazonaws.com/bezegoluzose/reader_digest_fix_it_yourself_manual_1977.pdf
    • https://s3.amazonaws.com/baxunaf/telugu_bible_software_for_pc.pdf
    • https://s3.amazonaws.com/bisapovepizaj/rediwotusa.pdf
    • http://bowegasobufur.myartsonline.com/60415563577.pdf
    • https://s3.amazonaws.com/jotizifime/customary_conversions.pdf
    • https://s3.amazonaws.com/remeranexe/wijesurelotu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin
100a0a974af8e2d733a67da1cead88727b42732631a5d9971ace519f865c6eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5732 bytes
font_01_sfnt_off00010aed.bin
71ff7c1158f81efe247ac8895456e2d4a1f10c43a63900fd6bad519104634024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 5608 bytes
font_02_sfnt_off00011d97.bin
cb449ab390cbc9c8c1560aede703b153dd24ae3be30c9b40d0b86447b1afed09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 6736 bytes
font_03_sfnt_off000130b4.bin
7e9389fcd7033aed3856f80b75ac475f9db450b44e02b8d8c57c226a34ef67be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 11256 bytes

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