Malicious PDF — malware analysis report

Static analysis result for SHA-256 5049b1ef74961591…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 21:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e0152c1355a63fb20ded015be473e0 SHA-1: 680aab783e8ddda83ad7502471e16985fd75d1fb SHA-256: 5049b1ef74961591a584d76a7a14e6c7447001a9ac1c7ccd3f13a0b387c54e33
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=caracteristicas+de+la+cultura+mexicana+actual
    • https://cdn.sqhk.co/xelajuwodaf/thengjj/taxenexefonetelidore.pdf
    • http://rezokivi.medianewsonline.com/60860075418.pdf
    • https://cdn.sqhk.co/nizivatitogu/ohaFpOE/winking_lizard_restaurant_peninsula_ohio.pdf
    • https://cdn.sqhk.co/tobamozusaj/9jhYIhf/love_sms_ringtone_song_download.pdf
    • https://cdn.sqhk.co/sogunixe/hfhd1W4/diaphragmatic_hernia_in_dogs.pdf
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/ca0f61f7ca.pdf
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/ddcab694.pdf
    • http://raraveluwogevuw.mypressonline.com/jspdf_autotable_line_break_not_working.pdf
    • https://cdn.sqhk.co/xeliwiwogivo/2jdvLto/natusimosazuwotevul.pdf
    • http://kesenirevapovid.iblogger.org/how_to_use_ps3_controller_on_android.pdf
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/3b8921f.pdf
    • https://nedilobimizedov.weebly.com/uploads/1/3/5/3/135346130/vadukajuniso.pdf
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/702fef4786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefunupu/pizegusalun.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_739bae621c4a4fa5b64a489048cc47b8.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/fuzemosumakasimixir.pdf
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_b759f08c6cbe4e78a168a2b724d76c6a.pdf?index=true
    • http://gurebuvijo.epizy.com/how_to_hook_up_a_rca_soundbar_to_a_hisense_tv.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/printable_brain_teasers_worksheets_for_middle_school.pdf
    • http://nufufud.epizy.com/45564805321.pdf
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_a717c7d8a25148f1990b3dcc7225724f.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_1abdccfb3f8c4fe496e4d5ebb50ab93a.pdf?index=true
    • https://s3.amazonaws.com/libowebujakux/space_between_descendants_2_piano_sheet_music.pdf
    • https://s3.amazonaws.com/pisedij/ssc_mark_sheet_2017.pdf
    • http://bagurofodi.epizy.com/15_hardest_sat_math_questions.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab1.bin
ad15008c80d1e2d9fdb1c2b018eb8caa6bfbd2121c39acb5c78766a8cc331a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 5056 bytes
font_01_sfnt_off00010bc7.bin
94fef12734aeea9e3090b18e095a668195678cc4e427aaa276ade02c53f7cb10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 11896 bytes

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