Malicious PDF — malware analysis report

Static analysis result for SHA-256 455fbfa09c44de33…

MALICIOUS

PDF

76.1 KB Created: 2021-04-18 15:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3f9689b024b9b58bf72e7de44f846e12 SHA-1: 106769abc51d20b6fbc071e3e1309dd2ddd11b3d SHA-256: 455fbfa09c44de33059157074f520c113ed8e5d90f92bd3953e02b013b0bca46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=xr2+remote+codes+element+tv PDF link annotation
    • http://tonemisi.medianewsonline.com/farmacologia_benzodiazepnicos.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/gumuzixeno.pdfIn PDF document text
    • http://yesstore.pro/61293611389nd05h.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/11532920510.pdfIn PDF document text
    • http://korsabarca.com/free_online_reading_worksheets_for_4th_gradedo0wq.pdfIn PDF document text
    • http://construt.site/beautys_punishment_audiobookp0ckd.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/gofilafixu/zugijazupekukegaxowudetin.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_e241ab1a4f0f4cf2a04ab78e4f86844b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/sejawagedipazawopiremi.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/75146829555.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/multiplication_worksheets_grade_4_common_core.pdfIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_139da1d3f6ff47048e800f98f74d5bae.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_fc5a36b1dbab4291a41cf2daef91b937.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/kepuxikozidisad.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_2115db647a71493d9eaeb148262caa31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38a692f-72f7-491b-a955-356ecc908a5d/grandparents_day_songs_in_hindi_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/bubble_shooter_android_online_spielen.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/73330995081.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/aakasha_ganga_malayalam_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ecec62-475b-43c7-81d5-a134ec19aa91/world_map_outline_continents_and_oceans.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_c642ffd7eb564a459da7048e48274f1c.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5044 bytes
SHA-256: 37edb4d8a296531d59adab416475f137e74208e16d2bec634487337226660650
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 10600 bytes
SHA-256: ef28ec784fd8f34b6bea5ac45fc91867d26d0d8311a76442a65054176ec1593d

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