Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec23df9ac8318ff…

MALICIOUS

PDF

76.5 KB Created: 2021-02-23 03:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f4a10821a844699293263f102a23479 SHA-1: 9c65af5380ba55075788954cd9c3722b158211be SHA-256: 7ec23df9ac8318fffb2a0a8be0d680e5109f84d12e237512a8bf3a6b9d276c0c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=bien+dit+french+1+online+textbook+answers
    • https://cdn.sqhk.co/libuzewis/MgdPhgy/jutigobilazujafakuxupek.pdf
    • https://cdn.sqhk.co/ligazupevu/hhhhhdq/descargar_warriors_of_the_universe_online_hack_apk.pdf
    • https://cdn.sqhk.co/winelolibug/ididGOB/ghost_rider_4k_ultra_hd_wallpaper_download.pdf
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/2982801.pdf
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/duzanusulalorivik.pdf
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/doziwavevuluwipawo.pdf
    • https://cdn.sqhk.co/rapedipular/idji8Ba/slicer_3d_view.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/1627288.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tesasubawalozan/first_aid_guide_uk.pdf
    • https://s3.amazonaws.com/wovugi/puvolijagi.pdf
    • https://s3.amazonaws.com/fadupazageraf/96870370815.pdf
    • https://s3.amazonaws.com/gapivegek/fotelow.pdf
    • http://kezuxitejapub.epizy.com/bsf_online_registration_form_2018.pdf
    • http://momerulazem.rf.gd/bullet_basya_movie_song.pdf
    • https://s3.amazonaws.com/joterige/burger_king_gutscheine_september_2015.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_off0000df10.bin
733ab2f637bde138217069a52ea62ccdd135ca1d62df6ff1db0b1c6e42dc7383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5360 bytes
font_01_sfnt_off0000f14c.bin
390e2c6256d58e0d3f222ea3227a26dac37fb1a3808ac7290506ac3c14cf75e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 11104 bytes
font_02_sfnt_off000116c8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 4324 bytes

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